Test #2B Sample Test

1. The oxidation of the most reduced forms of carbon yield the greatest amounts of energy. The oxidation of which of the following would yield the greatest amount of energy?
a. protein
b. nucleic acids
c. carbohydrates
d. fats and lipids
e. inorganic precursors
2. The the majority of ATP from respiration is produced during which of the following processes?
a. fermentation
b. citric acid cycle
c. glycolysis
d. oxidative phosphorylation
e. Kreb's cycle
3. The molecule used as an energy intermediate or "currency" in the cell is which of the following?
a. glucose
b. carbon dioxide
c. biotin
d. adenosine triphosphate
e. pyruvate
4. Which of the following would be MOST likely to be an enzyme cofactor?
a. pyruvate
b. glucose
c. succinate
d. citrate
e. biotin
5. An enzyme does which of the following?
a. raises chemical potential energy
b. lowers chemical potential energy
c. raises activation energy
d. lowers activation energy
e. increases the energy obtained from a reaction
6. Which 4 carbon acid is combined with acetyl-CoA to produce citric acid to initiate the Kreb's cycle?
a. malonate
b. oxaloacetae
c. pyruvate
d. furmerate
e. succinate
7. The direct transfer of a phosphate to an ATP by ATP synthase occurs during which of the following?
a. substrate level phosphorylation
b. photo-induced phosphorylation
c. oxidative phosphorylation
d. chemically mediated phosphorylation
e. none of the above
8. Which of the following would NOT be produced during the Kreb's cycle?
a. ATP (as GTP)
b. pyruvate
c. NADH2
d. citric acid
e. carbon dioxide
9. Thiomicrospira crunogena is a organism that derives its energy from the oxidation of sulfur and it acquires is carbon from carbon dioxide. It would be which of the following?
a. chemoautotrouph
b. photoautotrogh
c. photoheterotrouph
d. chemoheterotroph
e. none of the above
10. If bacteria were fed radioactive oxygen, what compound would the majority of the radioactive label appear?
a. ATP
c. carbon dioxide
d. water
e. pyruvate
11. Which of the following is most reduced?
a. Methane (CH4)
b. Oxaloacetate
c. Pyruvate
d. Glucose
e. Glucose-6-phosphate
12. Which of the following temperatures would most likely kill a thermophile?
a. -20°C
b. 0°C
c. 30°C
d. 50°C
e. 100°C
13. For each reduced flavin adenine dinucluotide (FAD) produced, how many ATP's are obtained?
a. one
b. two
c. three
d. four
e. five
14. Malonate is an analog to succinate, i.e. malonate is structurally similar to succinate (which is an acid of the Krebs cyle). Succinate is converted to fumerate by the enzyme succinate dehydrogenase. Malonate would most likely be which of the following with respect to succinate dehydrogenase?
a. an allosteric molecule
b. a competitive inhibitor
c. an feedback inhibitor
d. an end product inhibitor
e. a noncompetitive inhibitor
15. An organism that would grow well in either the presence of or absence of oxygen would be called which of the following?
a. obligate anaerobe
b. microaerophillic
c. intermediate aerobe
d. facultative anaerobe
e. obligate aerobe
16. Processes that are involved in generating structural components are best described as which of the following?
a. catabolic
b. metabolic
c. protein synthetic
d. anabolic
e. hydrolytic
17. Which of the following best describes how enzymes work?
a. lowering activation energy
b. reducing the difference in chemical potential of the reaction
c. changing the substrate to be more effective
d. making the reaction more exothermic
e. they increase the substrate concentration
18. In fermentation tests, mineral oil is layered in a tube to do which of the following?
a. reduce evaporation of media
b. prevent oxygen from destroying critical media components
c. keep the culture anaerobic
d. provide an additional carbon source for growth
e. none of the above
19. Agar is which of the following?
a. a nutrient component
b. found in all chemically complex media
c. is the carbon source in minimal media
d. is used in selective media so that only some organisms will grow
e. forms a gel that is the solid support of slants and plate media
20. In any spontaneous biochemical reaction, the chemical potential of the substrates must be greater than the chemical potential of which of the following?
a. reactants
b. enzyme
c. cofactors
d. holoenzyme
e. products