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Cards In This Set
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Energy input is required for polymerization reactions.
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True.
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If a protein has a region that contains Valine, Leucine, Alanine, Isoleucine, and phenylalanine, how would you expect it to behave in an aqueous solution?
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It would most likely be clustered towards the interior of the protein to minimize it interaction with water.
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What single difference distinguishes the 20 amino acids found in cellular proteins from eachother?
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Each type of amino acid possesses a distinct R group with different chemical structure and reactivity.
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Amino acids are only added to the C-terminus of a protein. What is the chemical group on the protein to which these amino acids are added?
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Carboxylic Acid.
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True or False: All of the chemical bonds that hold proteins into their final three-dimensional form are noncovalent interactions.
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False.
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What is meant by an enzymes "induced fit"?
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The enzyme undergoes conformation change upon binding to the substrate.
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What happens to an enzyme after the reaction it catalyzes is completed?
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Nothing-the enzyme is not catalyzed by the reaction!
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Between starch and cellulose, which is a better source of nutrition and why?
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Starch.
It bonds between the glucose subunits and are easy for humans to digest. |
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Name two parts that are capable of forming hydrogen bonds with water.
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Phosphate and Choline.
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True or False: the plasma membrane allows free passage of all molecules from the "outside of the cell" to the "inside".
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False.
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Plasma membranes are impermeable to water. What categories of amino acid side chains would you expect to find most abundantly in the portions of membrane proteins that cross the plasma membrane?
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Hydrophobic.
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Name four macromolecules that are held together by covalent bonds between monomers and are synthesized through condensation reactions.
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Nucleic Acids.Triglycerides [fats].Carbohydrates.Proteins.
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The passage of water into the membrane of the plant cell occurs through where?
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Mostly through simple diffusion [osmosis].
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Name two facts about facilitated diffusion.
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It allows molecule to be transported only in the direction of their concentration gradients.
Requires membrane-spanning proteins. |
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Name two statements about active transport.
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Requires membrane-spanning proteins.
Requires expenditure of energy, in the form of ATP hydrolysis or favorable gradient of another molecule. |
