UMD BCHM 461 - testbank-4e-CH05 (9 pages)

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testbank-4e-CH05



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testbank-4e-CH05

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Pages:
9
School:
University of Maryland, College Park
Course:
Bchm 461 - Biochemistry I

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Chapter 5 Protein Function Multiple Choice Questions 1 Reversible binding of a protein to a ligand oxygen binding proteins Page 157 Difficulty 2 Ans D The interactions of ligands with proteins A B C D E are relatively nonspecific are relatively rare in biological systems are usually irreversible are usually transient usually result in the inactivation of the proteins 2 Reversible binding of a protein to a ligand oxygen binding proteins Page 158 Difficulty 1 Ans D A prosthetic group of a protein is a non protein structure that is A B C D E a ligand of the protein a part of the secondary structure of the protein a substrate of the protein permanently associated with the protein transiently bound to the protein 3 Reversible binding of a protein to a ligand oxygen binding proteins Pages 158 159 Difficulty 2 Ans B When oxygen binds to a heme containing protein the two open coordination bonds of Fe2 are occupied by A B C D E one O atom and one amino acid atom one O2 molecule and one amino acid atom one O2 molecule and one heme atom two O atoms two O2 molecules 4 Reversible binding of a protein to a ligand oxygen binding proteins Pages 160 161 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 B C D E hyperbolic linear with a negative slope linear with a positive slope random sigmoidal 52 Chapter 5 Protein Function 5 Reversible binding of a protein to a ligand oxygen binding proteins Page 160 Difficulty 2 Ans E Which of the following statements about protein ligand binding is correct A B C D E The Ka is equal to the concentration of ligand when all of the binding sites are occupied The Ka is independent of such conditions as salt concentration and pH The larger the Ka association constant the weaker the affinity The larger the Ka the faster is the binding The larger the Ka the smaller the Kd dissociation constant 6 Reversible binding of a protein to a ligand oxygen binding proteins Page 163 Difficulty 2 Ans E Myoglobin and the subunits of hemoglobin have A B C D E no obvious structural relationship very different primary and tertiary structures very similar primary and tertiary structures very similar primary structures but different tertiary structures very similar tertiary structures but different primary structures 7 Reversible binding of a protein to a ligand oxygen binding proteins Page 165 Difficulty 2 Ans B An allosteric interaction between a ligand and a protein is one in which A B C D E binding of a molecule to a binding site affects binding of additional molecules to the same site binding of a molecule to a binding site affects binding properties of another site on the protein binding of the ligand to the protein is covalent multiple molecules of the



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