6. Which of the following best explains about the usefulness of the production of ethanol in yeast cells under anaerobic conditions?

A. Ethanol keeps the electron transport system functioning
B. Yeast would be unable to activate the enzymes of the Krebs cycle without ethanol
C. The process generates oxygen, which is required for glycolysis
D. The process regenerates NAD⁺, which is required for glycolysis

7. The final electron acceptor in the electron transport chain is

A. CoQ
B. a cytochrome
C. FMN
D. oxygen

8. The amount of energy (cal/mole) in an ATP molecule produced by a cell from glucose by fermentation is

A. greater than aerobic metabolism
B. less than aerobic metabolism
C. exactly or approximately equal to aerobic metabolism
D. none of the above

9. The enzymes for glycolysis are located

A. on the inner surface of the cell membrane
B. on the inner membrane of the mitochondrion
C. on the outer membrane of the chloroplast
D. in the cytoplasm

10. Glucose can be broken down to pyruvate by

A. Entner-Doudoroff pathway
B. tricarboxylic acid cycle
C. both (a) and (b)
D. none of these