16. The immediate reducing power of ribonucleotide reductase is provided by:
(A) Thioredoxin.
(B) Ferredoxin.
(C) NADH.
(D) Fe-S complex.
(E) Cyt P-450.

15. The immediate reducing power of ribonucleotide reductase is provided by: (A) thioredoxin (B) Ferredoxin (C) NADH (D) Fe-S complex (E) Cyt P-450.

15. The immediate reducing power of ribonucleotide reductase is provided by: (A) thioredoxin (B) Ferredoxin (C) NADH (D) Fe-S complex (E) Cyt P-450

17. Which of the following hormones affects the arcuate nucleus of the hypothalamus and ultimately results in an inhibition of nutrient intake? (A) Adiponectin. (B) Leptin. (C) Ghrelin. (D) Gucagon. (E) None of the above.

18. The reaction, glutamate + + a-ketoglutarate + NAD(P)H + , is catalyzed by: (A) Nitrogenase. (B) Carbamoyl-phosphate synthetase (CPS-I). (C) Glutamate dehydrogenase (GDH). (D) Glutamine synthetase (GS). (E) None are true.

19. Nitroglycerine is a potent _____ because of the release of _____(A) antioxidant； O2 (B) vasoconstrictor； NO. (C) vasodilator； NO. (D) muscle tensor； O2 (E) All are true

20. By definition of a Lewis acid, choose the correct answer. 1. 2. 3. 4. NH35. (A) 1 and 3 are Lewis acids. (D) 1 and 4 are Lewis acids. (B) 2 and 4 are Lewis acids. (E) 2 and 3 are Lewis acids. (C) 5 is Lewis acid.

21. What enzyme breaks apart the hydrogen bonds between two strands of DNA? (A) Polymerase I. (B) Polymerase III. (C) Ligase. (D) Helicase. (E) Okazaki.

22. Which statement about the elongation of the lagging strand during DNA replication is correct? (A) It is synthesized in a 3' 5' direction. (C) It requires a short RNA primer to proceed. (B) It progresses (grows) toward the replication fork. (D) It is synthesized by DNA ligase. (E) It is synthesized continuously.

23. Using RNA as a template for protein synthesis instead of translating proteins directly from the DNA is advantageous for the cell because (A) RNA is much more stable than DNA. (B) RNA acts as an expendable copy of the genetic material. (C) only one mRNA molecule can be transcribed from a single gene, lowering the potential rate of gene expression. (D) tRNA, rRNA and others are not transcribed. (E) mRNA molecules are subject to mutation but DNA is not.

24. Which of the following is   not   true of RNA processing? (A) Exons are cut out before mRNA leaves the nucleus. (B) Nucleotides may be added at both ends of the RNA. (C) Ribozymes may function in RNA splicing. (D) RNA splicing can be catalyzed by spliceosomes. (E) A primary transcript is often much longer than the final RNA molecule that leaves the nucleus.

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