Chapter 5 Testbank

Chapter 5 Testbank - Chapter 5 Protein Function Multiple...

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Chapter 5 Protein Function Multiple Choice Questions 1. Reversible binding of a protein to a ligand: oxygen-binding proteins Page: 153 Difficulty: 2 Ans: D The interactions of ligands with proteins: A) are relatively nonspecific. B) are relatively rare in biological systems. C) are usually irreversible. D) are usually transient. E) usually result in the inactivation of the proteins. 2. Reversible binding of a protein to a ligand: oxygen-binding proteins Page: 154 Difficulty: 1 Ans: D A prosthetic group of a protein is a non-protein structure that is: A) a ligand of the protein. B) a part of the secondary structure of the protein. C) a substrate of the protein. D) permanently associated with the protein. E) transiently bound to the protein. 3. Reversible binding of a protein to a ligand: oxygen-binding proteins Pages: 154 - 155 Difficulty: 2 Ans: B When oxygen binds to a heme-containing protein, the two open coordination bonds of Fe 2+ are occupied by: A) one O atom and one amino acid atom. B) one O 2 molecule and one amino acid atom. C) one O 2 molecule and one heme atom. D) two O atoms. E) two O 2 molecules. 4. Reversible binding of a protein to a ligand: oxygen-binding proteins Page: 156 Difficulty: 2 Ans: A In the binding of oxygen to myoglobin, the relationship between the concentration of oxygen and the fraction of binding sites occupied can best be described as: A) hyperbolic. B) linear with a negative slope. C) linear with a positive slope. D) random. E) sigmoidal.
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Chapter 5 Protein Function 5. Reversible binding of a protein to a ligand: oxygen-binding proteins Pages: 155-156 Difficulty: 2 Ans: E Which of the following statements about protein-ligand binding is correct? A) The K a is equal to the concentration of ligand when all of the binding sites are occupied. B) The K a is independent of such conditions as salt concentration and pH. C) The larger the K a (association constant), the weaker the affinity. D) The larger the K a , the faster the binding. E) The larger the K a , the smaller the K d (dissociation constant). 6. Reversible binding of a protein to a ligand: oxygen-binding proteins Page: 159 Difficulty: 2 Ans: E Myoglobin and the subunits of hemoglobin have: A) no obvious structural relationship. B) very different primary and tertiary structures. C) very similar primary and tertiary structures. D) very similar primary structures, but different tertiary structures. E) very similar tertiary structures, but different primary structures. 7. Reversible binding of a protein to a ligand: oxygen-binding proteins Pages: 161-162 Difficulty: 2 Ans: B An allosteric interaction between a ligand and a protein is one in which: A) binding of a molecule to a binding site affects binding of additional molecules to the same site. B)
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Chapter 5 Testbank - Chapter 5 Protein Function Multiple...

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