12. The rate constant for the reaction 2I→ I₂ is 7.0x10⁶ m³mol^-1s^-¹ at
296 K and 7.7×10⁶ m³mol^-1s^-¹ at 303 K. What is E_a (kJ/mol)?
(A) 16.5
(B) 35.5
(C) 10.2
(D) 185

13. If the population decay channels of the excited state decay include three channels, such as fluorescence channel (kF = 109 s¯¹), internal conversion channel (kıc = 1012 s¯¹), and intersystem crossing channel (kIsc = 103 s¯¹), what is the observed fluorescence lifetime TF? (A) 1 psec (B) 1msec (C) 1 nsec (D) 1 µsec

14. If we want to acquire a Raman spectrum with a 785 nm laser for exciting a C-H stretching at 3000 cm-¹, what Stokes peak in nanometer (nm) will be appeared in the Raman spectrometer? (A) 985 (B) 1064 (C) 1027 (D) 633

15. At room temperature, which kind of molecular motion has least contribution to the entropy for CH4?(A) Rotation (B) Vibration (C) Translation (D) Electronic

1. Aside from maintaining the integrity of its hereditary material, the most important general metabolic concern of a cell is: (A) keeping its glucose levels high. (B) maintaining a constant supply and concentration of ATP. (C) preserving its ability to carry out oxidative phosphorylation. (D) protecting its enzymes from rapid degradation. (E) running all its major metabolic pathways at maximum efficiency.

2. A function of the glyoxylate cycle, in conjunction with the citric acid cycle, is to accomplish the: (A) complete oxidation of acetyl-CoA to CO2 plus reduced coenzymes. (B) net conversion of lipid to carbohydrate. (C) net synthesis of four-carbon dicarboxylic acids from acetyl-CoA. (D) net synthesis of long-chain fatty acids from citric acid cycle intermediates. (E) Both B and C are correct

3. The conversion of 1 mol of pyruvate to 3 mol of CO2 via pyruvate dehydrogenase and the citric acid cycle also yields_______mol of NADH,_______mol of FADH2, and______mol of ATP (or GTP). (A) 2; 2; 2 (B) 3; 1; 1 (C) 3; 2; 0 (D) 4; 1; 1 (E) 4; 2; 1

4. The conversion of palmitoyl-CoA (16:0) to myristoyl-CoA (14:0) and 1 mol of acetyl-CoA by the ẞ-oxidation pathway results in the net formation of: (A) 1 FADH, and 1 NADH. (B) 1 FADH, and 1 NADPH. (C) 1 FADH2, 1 NADH, and 1 ATP. (D) 2 FADH, and 2 NADH. (E) 2 FADH2, 2 NADH, and 1 ATP.

5. If an aerobic organism (for example, the bacterium E. coli) were fed each of the following four compounds as a source of energy, the energy yield per mole from these molecules would be in the order: (A) alanine ＞ glucose ＞ palmitate (16:0). (B) glucose ＞ alanine ＞ palmitate. (C) glucose palmitate ＞ alanine. (D) palmitate ＞ alanine ＞ glucose. (E) palmitate ＞ glucose ＞ alanine.

6. In amino acid catabolism, the first reaction for many amino acids is a(n): (A) decarboxylation requiring thiamine pyrophosphate (TPP). (B) hydroxylation requiring NADPH and O2. (C) oxidative deamination requiring NAD+. (D) reduction requiring pyridoxal phosphate (PLP). (E) transamination requiring pyridoxal phosphate (PLP).

7. Serine or cysteine may enter the citric acid cycle as acetyl-CoA after conversion to:(A) oxaloacetate.(B) propionate.(C) pyruvate.(D) succinate.(E) succinyl-CoA.

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