Reference no: EM1399213

1. Metabolism is
A. the means by which DNA is stored.
B. the sum of all the anabolic and catabolic reactions in a cell.
C. the reactions that break fuel molecules down to gain energy.
D. the reactions that synthesise molecules in the cell.
E. the sum of all the reactions taking place in the mitochondrial matrix.

2. The Krebs cycle
A. breaks down pyruvate.
B. oxidizes two-carbon units to produce carbon dioxide and reduced coenzymes.
C. oxidizes glycerol.
D. drives H+ out of the mitochondrial matrix.
E. uses GTP rather than ATP to supply phosphate groups.

3. Which of the following statements about the glycolysis pathway in the cytosol is incorrect?
A. It makes ATP.
B. It makes acetyl-CoA.
C. It interacts with the pentose phosphate pathway.
D. All but three steps are reversible and therefore also operate in gluconeogenesis.
E. It is oxidative under aerobic conditions.

4. %u03B2 oxidation
A. breaks the %u03B2-glycosidic bonds in cellulose.
B. uses acetyl-CoA, NADH, and FADH2 to produce long-chain fatty acids.
C. generates pentose sugars.
D. oxidizes fatty acids to give acetyl-CoA, NADH, and FADH2.
E. Is part of triacylglycerol biosynthesis.

5. Gluconeogenesis is not capable of making glucose from
A. alanine.
B. lactate.
C. glycerol.
D. palmitate.
E. 2-oxoglutarate.

6. Which of the following statements is incorrect concerning photosynthesis in green plants?
A. It generates ATP, NADPH, and oxygen.
B. It adds carbon dioxide to a five-carbon sugar that is then cleaved to form two molecules of
phosphoglycerate.
C. Its enzymes are found in the mitochondria.
D. It uses light energy to drive the splitting of water.
E. Its enzymes are found in the chloroplasts.

7. Positive feedback is operating
A. when adenosine monophosphate activates phosphofructokinase.
B. when cAMP activates transcription of the lac operon.
C. when tryptophan inhibits transcription of the trp operon.
D. when N-acyl-HSL promotes transcription of the lux operon.
E. in all the examples above.

8. ATP
A. is converted to ADP as H+ enters the mitochondrial matrix.
B. is a coenzyme.
C. passes through the outer mitochondrial membrane by simple diffusion.
D. cannot be made in the absence of oxygen.
E. concentrations fall to a low level in resting cells.