9. All of the following are considered "weak" interactions in proteins, except:

(A) hydrogen bonds.

(B)hydrophobic interactions.

(C) ionic bonds.

(D) peptide bonds.

(E) van der Waals forces.

12. All of the following are considered "'weak" interactions in proteins, except : (A) hydrogen bonds (B) hydrophobic interactions (C) ionic bonds (D) peptide bonds (E) van der Waals forces

10. When oxygen binds to a heme-containing protein, the two open coordination bonds of Fe2+ are occupied by:(A) one O atom and one amino acid atom.(B)one O2 molecule and one amino acid atom.(C) one O2 molecule and one heme atom.(D) two O atoms.(E) two O2 molecules.

11. Glucose labeled with 14C in C-1 and C-6 gives rise in glycolysis to pyruvate labeled in:(A) A and C.(B)all three carbons.(C) its carbonyl carbon.(D) its carboxyl carbon.(E) its methyl carbon.

12. Which of the following molecules can inhibit glycogen phosphorylase a by binding to an allosteric site?(A) AMP.(B)calcium.(C) GDP.(D) glucagon.(E) glucose.

13. Transamination from alanine to a-ketoglutarate requires the coenzyme:(A) biotin.(B)NADH.(C) No coenzyme is involved.(D) pyridoxal phosphate (PLP).(E) thiamine pyrophosphate (TPP).

14. In an anaerobic muscle preparation, lactate formed from glucose labeled in C-3 and C-4 would be labeled in:(A) all three carbon atoms.(B)only the carbon atom carrying the OH.(C) only the carboxyl carbon atom.(D) only the methyl carbon atom.(E) the methyl and carboxyl carbon atoms.

15. If electron transfer in tightly coupled mitochondria is blocked (with antimycin( A ) between cytochrome b and cytochrome cl, then:(A) all ATP synthesis will stop.(B)ATP synthesis will continue, but the P/O ratio will drop to one.(C) electron transfer from NADH will cease, but O2 uptake will continue.(D) electron transfer from succinate to O2 will continue unabated.(E) energy diverted from the cytochromes will be used to make ATP, and the P/O ratio will rise.

16. If electron transfer in tightly coupled mitochondria is blocked (with antimycin( A ) between cytochrome b and cytochrome c1, then:(A) all ATP synthesis will stop.(B)ATP synthesis will continue, but the P/O ratio will drop to one.(C) electron transfer from NADH will cease, but O2 uptake will continue.(D) electron transfer from succinate to O2 will continue unabated.(E) energy diverted from the cytochromes will be used to make ATP, and the P/O ratio will rise.

17. If a person's urine contains unusually high concentrations of urea, which one of the following diets has he or she probably been eating recently?(A) High carbohydrate, very low protein(B)Very high carbohydrate, no protein, no fat(C) Very very high fat, high carbohydrate, no protein(D) Very high fat, very low protein(E) Very low carbohydrate, very high protein

18. Which of the below is not required for the oxidative decarboxylation of pyruvate to form acetyl-CoA?(A) ATP(B)CoA-SH(C) FAD(D) Lipoic acid(E) NAD+

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