flashcard set{{course.flashcardSetCoun > 1 ? Which of the following is LEAST likely to be an endergonic reaction? Which molecule(s) can diffuse only with carrier proteins (not channel proteins)? Fimbriae, nucleoid and flagella are components of a prokaryotic cell. Molecular structure of triglycerides (fats), Saturated fats, unsaturated fats, and trans fats, Level up on the above skills and collect up to 160 Mastery points. I would definitely recommend Study.com to my colleagues. For example, the stomach enzyme pepsin works best at a pH of about 1.5 and the enzyme trypsin, which acts in the small intestine, works best at a pH of about 8. The correct answer is (C). What are the consequences of genes being carried on chromosomes? What is vitalism? The correct answer is (A). It involves the rendering of genetic codes. (b) Suppose that the typical diffusion coefficient for a reactant in aqueous solution at $25^{\circ} \mathrm{C}$ is $5.2 \times 10^{-4}\ \mathrm{m}^{2}\ \mathrm{s}^{-1}.$ If the critical reaction distance is 0.4 nm, what value is expected for the second-order rate constant for the diffusion-controlled reaction. 38. Transcription maintains the link between these two molecules and allows cells to use a stable nucleic acid as the genetic material while retaining most of their protein synthesis machinery. The hydrophilic heads are attracted to water, and therefore make up the outer part of the phospholipid bilayer. Properties of Water | Structure, Density & Molecules, How Major Catastrophic Events Disrupt the Course of Life on Earth, Characteristics of Living Things | Overview, List & Examples. A. In pharmaceuticals, phospholipids are used as part of drug delivery systems, which are systems that help transport a drug throughout the body to the area that it is meant to affect. Quiz Course 5.1K During protein synthesis, DNA is copied to another form called messenger RNA (mRNA). D. None of the above. However, in the 150 years since it was first proposed, the model has been revised and extended, and these revisions are important in explaining the inheritance patterns we see around us. Endocytosis and exocytosis are both __________ processes. It is used as a protein-rich supplement for the human diet. Second is reproduction. Level up on all the skills in this unit and collect up to 400 Mastery points! Functions of Nutrients However, other things will demonstrate all eight characteristics and, thus, be considered alive. Thigmotropism is directional growth in response to touch, such as a vine wrapping its tendrils around another plants stem. These will get you all set to learn more about the different types of macromolecules. The primary function of the ribosomes includes protein synthesis in all living cells that ensure the survival of the cell. Motor proteins that carry synaptic vesicles usually travel along microtubules, not actin filaments. "Phospholipid. Learn more about different types of sugar molecules: their structure, their chemical behavior, and how they can combine to form chains. Response to stimuli is the next characteristic in our countdown. In gram-positive bacteria, a __________ layer of peptidoglycan covers the outer membrane. They have high bioavailability, meaning that they are easy for the body to absorb. Phospholipids are found in high concentrations in many other animal and plant sources, such as soybeans, sunflowers, cotton seeds, corn, and even cow brains. 6. Polymer is a protein aka peptide Lots of amino acids linked together. Finally, we come to life's ability to adapt through evolution. Polymer is a protein aka peptide Lots of amino acids linked together. Negative feedback is the most common type of regulation in which the accumulation of the end product slows the process of producing more. While all living things may not share specific life stages, all life does grow and develop. WebAP Biology Practice Test: Unit 2 Cell Structure & Function Ribosomes are responsible for polypeptide synthesis and are located both free in the cytoplasm and on the rough endoplasmic reticulum. All other trademarks and copyrights are the property of their respective owners. Questions 17-19 - Refer to the following list of molecules. Countercurrent exchange reduces heat loss when arteries carrying warm blood down the legs of waterfowl are in close contact with veins returning cold blood from cold lakes or ponds. This is essential because it call keep many harmful or dangerous substances from entering and destroying the cell while still allowing the necessary substances to enter. The vast majority of genes are encoded with a single scheme (see the RNA codon table).That scheme is often referred to as the canonical or standard genetic code, Pathogenic Protists Diseases & Examples | What are Diseases Caused by Protists? Sodium. Maybe you've heard DNA discussed as the "genetic material." This simply means that living things are made of cells. After the RNA folds into its tertiary structure, it is L-shaped, with the acceptor stem and T-arm forming an extended helix and the anticodon loop and D-arm similarly making another extended helix. Characteristics are traits or qualities. Log in or sign up to add this lesson to a Custom Course. The same holds true with blood sugar. The Study of Life | What is Biology the Study of? Thus, they both convert energy into a form that the cell can use. Lipids are molecules that include fats, waxes, and some vitamins, among others. WebIt controls protein synthesis, growth, cell division, and differentiation; It reserves heredity material in the form of DNA strands that also store RNA and proteins in the nucleolus; It is a section for the process of transcription wherein mRNA is produced to generate proteins; Assists in the exchange of RNA and DNA between the cell and the nucleus WebTo best understand your protein synthesis worksheet, lets cover the complete protein synthesis process that can be found in this article. AP Biology Main Menu >>. Please contact Savvas Learning Company for product support. 22. One way in which an animal adjusts to changes in their external environment within the normal range of homeostasis is known as acclimatization. The correct answer is (C). The correct answer is (C). 487 lessons, {{courseNav.course.topics.length}} chapters | Phospholipids are able to form cell membranes because the phosphate group head is hydrophilic (water-loving) while the fatty acid tails are hydrophobic (water-hating). In the 1850s, Austrian monk Gregor Mendel carried out experiments that laid the foundations of modern genetics. The sodium-potassium pump exchanges sodium for potassium across the plasma membrane of animal cells by pumping ions against steep concentration gradients. When the blood from the veins reaches the body core, it is almost as warm as the body. This means that plasmolysis occurs in 27. 20. The components of a cell and the arrangements of these individual parts within the cell form the cellular _____. Get unlimited access to over 84,000 lessons. Every fall for the past dozen years, I have begun my biology class in much the same way---with a question. In other words, think about how our bodies maintain a constant body temperature or how blood sugar levels are consistent. Quiz. Well, all sorts of interesting stuff! The passing on of traits from parents to their offspring is called _____. These reactions vary in form and function but promote processes such as protein synthesis, chemical digestion, cell division, or energy transformation. In eukaryotes, the coding sequence of the DNA is first transcribed into mRNA in the nucleus. This unit is part of the Biology library. Cellular Respiration Steps & Diagram | What is Cellular Respiration? 40. Both convert energy from sugar, fats and other fuels into ATP, They are both part of the endomembrane system. Dehydration synthesis or a condensation reaction. WebRibosomes are either encompassed within the endoplasmic reticulum or are freely traced in the cells cytoplasm. Metabolism is essentially a collection of chemical reactions occurring within the body (or cell). Hydrophilic portion of the phospholipid bilayer, Hydrophobic portion of the phospholipid bilayer. The secondary structure of tRNA containing the acceptor region, D- and T-arms and the anticodon loop is said to resemble a cloverleaf. This helps keep the contents of the cell working properly and separates the inside of the cell from the surrounding environment. You have not finished your quiz. How did fruit flies help researchers discover that genes are on chromosomes? Dominic Corsini has an extensive educational background with a B.S. A. Fatty acid B. Phosphate group C. Glucose D. Carboxylate group, 3. Something is considered _____ if it contains the eight characteristics of life. The sugar molecules are too large to move across the selectively permeable membrane. a. Desmosomes are intercellular junctions that function like rivets. Is the magnitude of the change in potential energy from an angle of $90^{\circ}$ to $45^{\circ}$ greater than, less than, or the same as the magnitude of the change from $45^{\circ}$ to $0^{\circ}$ ? Diffusion of sugar from an area of low concentration to an area of high concentration, Osmosis of water from an area of low water concentration to an area of high water concentration, Osmosis of water from an area of low solute concentration to an area of high concentration, Osmosis of sugar from an area of low water concentration to an area of high water concentration. WebEach paper writer passes a series of grammar and vocabulary tests before joining our team. WebProtein. May aid in the transport of materials from one side of the membrane to the other, Membrane proteins of adjacent cells may hook together in various kinds of junctions, May be an enzyme or series of enzymes involved in metabolic pathways, May be a membrane carbohydrate used for cell-to-cell recognition. How long does the image of a 12-in. Biology is brought to you with support from the Amgen Foundation, Middle school Earth and space science - NGSS, World History Project - Origins to the Present, World History Project - 1750 to the Present. Learn about monomers, polymers, dehydration synthesis, and hydrolysis reactions! Aquaporins are a special type of channel protein that speeds up the passage of __________ molecules. Test Period - You have 30 minutes to answer 40 questions. The Calvin Cycle can be broken down into 3 steps: (1) Carbon fixation, which incorporates each CO 2 molecule by attaching it to a 5-carbon sugar (ribulose-1,5-bisphosphate), (2) Reduction, where each molecule of 3-phosphoglycerate receives an additional phosphate group from ATP and hydrogen from NADPH forming You were a baby, then a toddler, then a young child, etc Today, you're probably an adult. Sometimes, a single amino acid can be a key piece of this. Living Organisms Overview & Characteristics | What are Living Things? If a cell is immersed in an isotonic solution, there will be no net movement of water. Proteins: the amazing machines of the cell! Do you have a sweet tooth? Our fourth characteristic is homeostasis. Phagocytosis is a type of endocytosis in which the cell intakes __________. Endocytosis is the process in which substances are going __________ the cell and exocytosis is the process in which substances are going _________ the cell. WebIn the Protein Synthesis lab, you will learn about the difference between protein synthesis in prokaryote (using E. coli) and eukaryote (using CHO cells). Biologydictionary.net Editors. What is/are the functions of ribosomes? Typically, the rate of enzymatic reactions increases with temperature (up to a point), this is because increased temperature means increased energy means increased motion which makes for more frequent collisions of substrates with active sites. Fermentation consists of glycolysis plus reactions that regenerate NAD. 53 terms. Our seventh characteristic of life is that living things all grow and develop, which simply means they become bigger and mature. Oxidative phosphorylation uses energy released by the electron transport chain to power ATP synthesis. Microtubules, microfilaments and intermediate filaments are parts of the cytoskeleton structure. Cells are the most basic unit of life. The correct answer is (A). If this activity does not load, try refreshing your browser. Active transport involves the use of transport proteins to move solutes against a concentration gradient, which means they are pumping something (typically ions) from an area of lower concentration to an area of higher concentration. Protein synthesis takes place through a process called translation. AP Biology: Macromolecules. Explain. Mendel's model forms the core of our modern understanding of inheritance. The correct answer is (C). WebThe correct answer is (A). They automatically arrange themselves in a certain pattern in water because of these properties, and form cell membranes. What is Cell Theory? The diagram is showing a plant cell (notice the cell walls). The summary equation of photosynthesis is the reverse of that of cellular respiration. Khan Academy is a 501(c)(3) nonprofit organization. Multiple alleles, incomplete dominance, and codominance, Polygenic inheritance and environmental effects. The correct answer is (D). In eukaryotes, RNA is produced in the cell's nucleus and then moves to the cytoplasm to play a role in the production of protein. Also, this page requires javascript. The correct answer is (A). This is simply a reaction to an internal or external force. In gram-negative bacteria, a __________ layer of peptidoglycan covers the outer membrane. Biological Organization Hierarchy | What is Biological Organization? Oxygen, carbon dioxide, and urea are some molecules that can pass through the cell membrane easily. When there is physical or emotional stress, nervous and hormonal responses trigger smooth muscles in arteriole walls to contract. Homeostasis is the term used to describe maintaining a stable internal environment. Additionally, they are found in areas such as the lung and in joints, where they help lubricate cells. izzy8elle. To log in and use all the features of Khan Academy, please enable JavaScript in your browser. In Ion Pumps, for every ____ K+ ions that move into the cell, ____ Na+ ions move out of the cell. Your performance has been rated as %%RATING%%, Next Practice Test: This double layer, called a lipid bilayer, forms the main part of the cell membrane. Those who have a checking or savings account, but also use financial alternatives like check cashing services are considered underbanked. Multicellular life forms such as humans reproduce sexually, while unicellular life forms like bacteria reproduce asexually. Therefore, maintaining homeostasis is a vital characteristic of life. Phospholipid. 32. Directions - For each question, choose the best answer (unless otherwise stated) WebNote: For the most part, post-transcriptional processing is not covered in courses such as AP Biology. 15. The cytoskeleton refers to the fibers that organize activities and structures inside the cell. Systems with chemical equilibrium have a minimum amount of free energy, and therefore they cannot do any work, and will eventually die. Characteristics are traits or qualities. carbohydrate structure. The correct answer is (B). AP Biology: Macromolecules. 37. The correct answer is (A). 5. Ribosomes are responsible for polypeptide synthesis and are located both free in the cytoplasm and on the rough endoplasmic reticulum. The reactions release excess electrons at the anode which flow to the cathode. He has a master's degree in Physics and is currently pursuing his doctorate degree. They increase the heat in the cell, and therefore speed up the reaction by allowing reactants to attain the transition state more often, Enzymes speed up reactions by changing the amount of free energy available in the cell for reactions, Enzymes make endergonic reactions exergonic, Enzymes speed up reactions by bringing substrates together to undergo a chemical reaction. WebAP/College Biology; AP/College Chemistry; AP/College Environmental Science; AP/College Physics 1 Dehydration synthesis or a condensation reaction (Opens a modal) Hydrolysis Quiz 1. There is a net movement of solutes across membranes from an area of high concentration to an area of low concentration until they reach equilibrium. As a member, you'll also get unlimited access to over 84,000 carbohydrate structure. The correct answer is (C). Foods like milk and fresh vegetables contain sodium. As you complete the video lesson, make an effort to try to remember and expound upon each of the eight characteristics of life. 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WebFind out the important notes for NEET Biology. _____ reproduction occurs when an offspring is created without exchanging genetic information, such as in unicellular organisms. Fatty acids are long chains that are mostly made up of hydrogen and carbon, while phosphate groups consist of a phosphorus molecule with four oxygen molecules attached. Our mission is to provide a free, world-class education to anyone, anywhere. This represents a change in heritable traits (tameness) within the population and is a form of evolution. The correct answer is (A). Answers (A), (B) & (C) are catabolic because they result in the net release of energy with the end products being simpler than the input. It is an inescapable fact that all life forms adapt and undergo evolution. AP Biology Unit 2: Cell Structure & Function The correct answer is (C). Protein synthesis Protein Synthesis Steps. Question 23 - Use a calculator to solve the following question. 42 terms. in Educational Leadership, an M.S. Retrieved from https://biologydictionary.net/phospholipid/. Next, we come to heredity. This is a very important aspect of life: that metabolism as a whole is never at equilibrium. In a spherical cell, as the cell volume increases, the corresponding surface area will _________. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. Which is NOT a component of a phospholipid? The nuclear envelope, nucleolus and chromatin are all part of the nucleus. The correct answer is (A). The mitochondria and chloroplasts change energy from one form to another. Fortunately, biologists have developed a list of eight characteristics shared by all living things. Evolution is the change in heritable traits within a population. 14. Any items you have not completed will be marked incorrect. DNA replication and RNA transcription and translation. The osmolarity of the body fluids of sea stars (starfish) conforms to that of marine waters in which they are found. Learn about the amino acids that proteins are made of and how they are connected by peptide bonds. Our mission is to provide a free, world-class education to anyone, anywhere. How was vitalism usurped? If either of your parents has dark eyes, and you also have dark eyes, it's because of heredity. Level up on all the skills in this unit and collect up to 600 Mastery points! Khan Academy is a 501(c)(3) nonprofit organization. Your performance has been rated as %%RATING%%, Next Practice Test: 10. celinemejia. Biology Dictionary. Valium is an example of a medication that uses a phospholipid-based drug delivery system. Any items you have not completed will be marked incorrect. Which molecule is hydrophobic? copyright 2003-2023 Study.com. This allows the heat from the blood in the arteries to warm the cold blood returning in the veins. Cell division and protein synthesis are examples of chemical reactions in the body known as _____. 7. Prepping Students for College And University . Browse videos, articles, and exercises by topic. Chloroplasts convert solar energy into chemical energy to make sugar available for plant cells. 37 chapters | Question 34 - Refer to the following list of transport. In this way, a double layer is formed with phosphate group heads on the outside, and fatty acid tails on the inside. Learn more about the law of segregation, the law of independent assortment, and other key elements of Mendel's model. Osmosis is the diffusion of __________ molecules down their concentration gradient across a semi-permeable membrane. Also, this page requires javascript. Because enzymes are sensitive to their environment, certain chemicals can denature the protein, rendering it unable to perform its function. shelkina. Donate or volunteer today! The rough endoplasmic reticulum and the Golgi apparatus are the structures crucial in the synthesis of proteins that need to be secreted through The synthesis of a protein from many amino acids. Web-All macromolecules are formed through dehydration synthesis -all covalent bonds -water breaks bonds and gives off energy through hydrolysis. The correct answer is (D). Proteins found on the outer layer of the plasma membrane that provides the cell with an identifiable cell signature so that the body can distinguish between its own cells and foreign molecules are called __________. B. What organelles are involved in cellular respiration? The energy supplied is dependent upon the internal structure and specific bonds within the protein. Learn more about variations on Mendel's model. Level up on the above skills and collect up to 240 Mastery points Start quiz. All living things respond to stimuli in some manner; to see it, all we have to do is look. The correct answer is (B). 39. This figure depicts the lipid bilayer and the structure of a phospholipid: As membrane components, phospholipids are selectively permeable (also called semi-permeable), meaning that only certain molecules can pass through them to enter or exit the cell. 28. The mitochondria and chloroplasts change energy from one form to another. Lack of sodium might lead to high blood pressure. Some things, such as a virus, demonstrate only a few of these characteristics and are, therefore, not alive. Acclimatization is a temporary change. Plasmodesmata are channels in cell walls of plant cells. The correct answer is (D). _____ is the change in the heritable characteristics of a population over successive generations. If this amino acid is changed for a non-functional one, the mutation is not a silent mutation. Level up on the are actually regions of DNA found on chromosomes. 19. The mitochondria are responsible for cellular respiration. Think about a sunflower tilting towards the sun, a dog panting when hot, or trees losing their leaves in the fall when sunlight levels decrease. When it gets too high or too low, homeostasis is disrupted, and unfortunately, this can be deadly. They can also be split into smaller molecules called chemokines, which regulate a variety of activities in the cell such as production of certain proteins and migration of cells to different areas of the body. The amount of free energy in the cell does not affect the function of the enzyme. Try refreshing the page, or contact customer support. If something is alive it must be capable of reproducing. This unit is part of the Biology library. Conduction takes place when heat moves between two objects that are touching each other, such as a snake basking on a rock. Phospholipids have a hydrophilic (water loving) head and a hydrophoboic (water hating) tail. We can see sex linkage when genes are on X or Y chromosomes, genetic disorders when too few or too many chromosomes are inherited, and unusual inheritance patterns when our genes are in the chromosomes of mitochondria or chloroplasts. Does it depend on the distance the ruler is from the mirror? The correct answer is (C). Diffusion is a(n) __________ process and is the movement of particles from __________ concentration regions to __________ concentration regions. Questions 1-4 - Refer to the following list of organelles. Enrolling in a course lets you earn progress by passing quizzes and exams. Heredity means that our genetic information can be passed from one generation to another. All living things adapt though evolution. But what exactly is DNA, when you get right down to it? This concept is a little difficult for some students to grasp. Some large eukaryotic cells elongate themselves - what does this do? Chapter 2: Chemistry of Life. The correct answer is (A). Invite your students to play simulations . The correct answer is (C). Corsini has experience as a high school Life, Earth, Biology, Ecology, and Physical Science teacher. in Secondary Biology and General Science with a Minor in Environmental Education, an M.Ed. Intermediate filaments are a group of cytoskeletal elements. David N. Shier, Jackie L. Butler, Ricki Lewis. 26. Consider how dogs were domesticated from wolves. Enzymes work exclusively on specific substrates, based on their shape. Now this may seem like a straightforward question, but based on student responses, it isn't nearly that easy to answer. A net water movement of 0 means the amount of water entering the cell is the same amount of water leaving the cell. Please visit using a browser with javascript enabled. A change in the structure of an organism's internal or external environment that provokes a reaction is called a _____. Regulating cellular activities such as cell migration C. Forming the cell membrane and the membranes of other organelles in the cell D. All of the above, Biologydictionary.net Editors. It doesn't matter if those cells are plants, animals, fungi, or bacteria. Ribosomes of a cell help in translating genetic codes into a polypeptide chain. The synthesis of new polypeptides requires a coded sequence, enzymes, and messenger, ribosomal, and transfer ribonucleic acids (RNAs). The endoplasmic reticulum, golgi apparatus, lysosomes, and vesicles form the endomembrane system. Quiz Course 23K views. 12. Chemical energy is energy that is stored in chemicals. This is something you've probably witnessed already. The process in which two substances are simultaneously transported across a membrane by one protein is called 31. They are made of amino acids. Arterioles narrow, increasing blood pressure upstream in the arteries. {{courseNav.course.mDynamicIntFields.lessonCount}} lessons The correct answer is (C). A phospholipid is a type of lipid molecule that is the main component of the cell membrane. How do you know if something is alive? Donate or volunteer today! The ability of a living organism to adjust its internal environment to maintain stability is termed _____. The correct answer is (B). Next Next post: Six Resources with the Best AP Textbook Prices. I feel like its a lifeline. The correct answer is (D). 9. Learn how a gene can specify a protein through the processes of transcription and translation, and how alleles are versions of a gene that have different DNA sequences. We can obtain protein in foods such as nuts, lentils, beef, rice, chicken, beef etc. The correct answer is (D). Learn to define the eight characteristics, or traits and qualities, of life, from cellular organization to evolution. WebProtein Synthesis. "Phospholipid." In the food industry, phospholipids can act as emulsifiers, which are substances that disperse oil droplets in water so that the oil and water do not form separate layers. Christianlly has taught college Physics, Natural science, Earth science, and facilitated laboratory courses. These will get you all set to learn more about the different types of macromolecules. Turgor occurs when water enters the cell, causing the cell to have a lot of pressure. If you're seeing this message, it means we're having trouble loading external resources on our website. An error occurred trying to load this video. Once you are finished, click the button below. Please wait while the activity loads. Protein synthesis steps are twofold. A plant's cell wall is made out of __________ and a fungi's cell wall is made out of __________. _____ concerns the transformation of the organism as enters the growth process. Well, these responses are largely all wrong. WebThe branches of science known informally as omics are various disciplines in biology whose names end in the suffix -omics, such as genomics, proteomics, metabolomics, metagenomics, phenomics and transcriptomics.Omics aims at the collective characterization and quantification of pools of biological molecules that translate into the What is/are the functions of Smooth Endoplasmic Reticulums? Living organisms are made up of cells and must exhibit eight different characteristics established by biologists. DNA replication and RNA transcription and translation. Membrane Protein Functions Mitochondrial Protein Synthesis | Function, Process & Overview AP Biology: Homeschool Curriculum; For example, egg yolks contain phospholipids, and are used in mayonnaise to keep it from separating. 53 terms. The smooth endoplasmic reticulum is primarily involved in lipid metabolism and synthesis. Glyceraldehyde-3-phosphate is the reducing agent because it donates electrons to NAD, The correct answer is (A). Photomorphogenesis describes the effects of sunlight on plant growth. Starring glucose (blood sugar), sucrose (table sugar), and fructose (fruit sugar). Special bonus: learn how proteins get their shapes and why this so important for their function. Plus, get practice tests, quizzes, and personalized coaching to help you Biology is brought to you with support from the Amgen Foundation, Middle school Earth and space science - NGSS, AP/College Computer Science Principles, World History Project - Origins to the Present, World History Project - 1750 to the Present. Cell Theory Scientists & Overview | What Is Cell Theory? If chemical reactions occurred in a test tube, they would eventually reach chemical equilibrium. This process occurs in the cytoplasm. If this activity does not load, try refreshing your browser. Being part of a drug delivery system in some pharmaceuticals B. To log in and use all the features of Khan Academy, please enable JavaScript in your browser. But in the case of prokaryotes, the nucleoid is present in place of the nucleus, wherein all the genetic information is present. Consider yourself as an example. This is very good for plant cells and occurs in 29. Learn about monomers, polymers, dehydration synthesis, and hydrolysis reactions! Create your account. in Biology, and a K-12 Principal Certification Program. Endocytosis is the process by which a cell takes in substances by engulfing them in new vesicles formed from the plasma membrane. The eukaryotic cells genetic functions are housed in the nucleus and carried out by the ribosomes. Students often tell me that something is alive if it moves, or breathes, or thinks. Its like a teacher waved a magic wand and did the work for me. The binding of an effector to the allosteric site will change the shape of the active site (the site to which the substrate binds) allowing (or preventing) the substrate to attach. 36. The important thing to remember is that, in either case, living things reproduce. These polypeptide chains become functioning proteins only after undergoing certain modifications.
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