6.Which of the following amino acid residues would most likely be found in the interior of a globular protein?
(A) Isoleucine
(B) Arginine
(C) Aspartic acid
(D) Threonine

7.Quaternary structure of proteins is associated with (A) the overall shape of the polypeptide chain (B) simple proteins with only one subunit (C) the relative orientation of one polypeptide to another polypeptide in a multisubunit protein (D) the sum of secondary and tertiary interactions

8.Which one of the following statements about hemoglobin (Hb) and myoglobin (Mb) is true? (A) Adult Hb binds to oxygen more tightly than Mb binds (B) Fetal Hb binds oxygen more tightly than adult Hb (C) Adult Hb binds oxygen more tightly than either fetal Hb or Mb binds (D) Both Hb and Mb are tetrameric complex proteins

複選題9.Which of the following is a disorder caused by a genetic mutation in the keratin gene? (A) Cystic fibrosis (B) Alzheimer's disease (C) Epidermolysis bullosa (D) Sickle cell anemia

10. Which of the following statements about lactate dehydrogenase (LDH) is true? (A) An enzyme that breaks down lactose in milk (B) An enzyme that converts lactate to pyruvate during cellular respiration (C) An enzyme that converts pyruvate to lactate during anaerobic respiration (D) An enzyme that breaks down glycogen in the liver

11. If the y-intercept of a Lineweaver-Burk plot = 1.23 (sec/millimole) and the slope = 23.3 L/sec, KM equals: (A) 0.0348mM (B) 0.0527 mM (C) 18.9 mM (D) 28.7 mM

12. The Michaelis-Menten constant (KM) is (A) a rough measure of the affinity of the enzyme for the substrate (B) a measure of the resistance of the enzyme to denaturation (C) related to the molecular weight of the enzyme (D) a reflection of the percentage of polar amino acids in the enzyme

13. Which of the following statements about ATCase is true? (A) ATCase is an enzyme involved in glycolysis (B) ATCase is allosterically regulated by ATP and CTP (C) ATCase catalyzes the conversion of aspartate and carbamoy! phosphate into citrulline (D) ATCase is found exclusively in prokaryotes

14. Which of the following types of amino acids in an active site is most unlikely to be involved in enzyme catalysis? (A) Those with hydrophilic, neutral side-chains (B) Those with negatively charged side-chains (C) Those with positively charge side-chains (D) Those with hydrocarbon side-chains

15. What is the primary difference between chymotrypsin and trypsin? (A) Chymotrypsin cleaves peptide bonds between amino acids with basic side chains, while trypsin cleaves peptide bonds between amino acids with acidic side chains (B) Chymotrypsin is secreted by the pancreas, while trypsin is secreted by the stomach (C) Chymotrypsin cleaves peptide bonds between amino acids with aromatic side chains, while trypsin cleaves peptide bonds between amino acids with basic side chains (D) Chymotrypsin is involved in the absorption of amino acids in the small intestine, while trypsin is involved in the breakdown of carbohydrates

16. Which of the following is true about phospholipids, sphingolipids, and cholesterol? (A) All three are amphipathic molecules (B) All three contain a glycerol backbone (C) All three are primarily found in the plasma membrane (D) All three have a similar chemical structure AINN

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