For each question,choose the ONE BEST And Give Best Explanation [No Explanation nopoints :( ]
1. Metabolismis
A. the means by whichDNA is stored.
B. the sum of all theanabolic and catabolic reactions in a cell.
C. the reactions thatbreak fuel molecules down to gain energy.
D. the reactions thatsynthesise molecules in the cell.
E. the sum of all thereactions taking place in the mitochondrial matrix.
2. The Krebscycle
A. breaks downpyruvate.
B. oxidizes two-carbonunits to produce carbon dioxide and reduced coenzymes.
C. oxidizesglycerol.
D. drives H+ out of themitochondrial matrix.
E. uses GTP rather thanATP to supply phosphate groups.
3. Which of thefollowing statements about the glycolysis pathway in the cytosol isincorrect?
A. It makes ATP.
B. It makesacetyl-CoA.
C. It interacts with thepentose phosphate pathway.
D. All but three stepsare reversible and therefore also operate in gluconeogenesis.
E. It is oxidative underaerobic conditions.
4. %u03B2oxidation
A. breaks the%u03B2-glycosidic bonds in cellulose.
B. uses acetyl-CoA,NADH, and FADH2 to produce long-chain fatty acids.
C. generates pentosesugars.
D. oxidizes fatty acidsto give acetyl-CoA, NADH, and FADH2.
E. Is part oftriacylglycerol biosynthesis.
5.Gluconeogenesis is not capable of making glucose from
A. alanine.
B. lactate.
C. glycerol.
D. palmitate.
E. 2-oxoglutarate.
6. Which of thefollowing statements is incorrect concerning photosynthesis ingreen
plants?
A. It generates ATP,NADPH, and oxygen.
B. It adds carbondioxide to a five-carbon sugar that is then cleaved to form twomolecules of
phosphoglycerate.
C. Its enzymes are foundin the mitochondria.
D. It uses light energyto drive the splitting of water.
E. Its enzymes are foundin the chloroplasts.
7. Positivefeedback is operating
A. when adenosinemonophosphate activates phosphofructokinase.
B. when cAMP activatestranscription of the lac operon.
C. when tryptophaninhibits transcription of the trp operon.
D. whenN-acyl-HSL promotes transcription of the luxoperon.
E. in all the examplesabove.
8. ATP
A. is converted to ADPas H+ enters the mitochondrial matrix.
B. is a coenzyme.
C. passes through theouter mitochondrial membrane by simple diffusion.
D. cannot be made in theabsence of oxygen.
E. concentrations fall to a low levelin resting cells.
