Go on to the next page 11 10 which of the following

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10. Which of the following best explains why
enzymes are effective in facilitating chemical
reactions?
14. Of the graphs shown below, which is most
representative of the kinetics of ion transport
through a membrane channel?
11. Targeting of a newly synthesized protein is most
likely to require two different signal peptides for
which of the following destinations?
12. Approximately what fraction of the human
genome encodes proteins?
13. Which of the following contain DNA sequences
required for the segregation of chromosomes in
mitosis and meiosis?
(A) Telomeres
(B) Centromeres
(C) Nucleosomes
(D) Spliceosomes
(E) Ribosomes
(E)
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15. In eukaryotic photosynthetic cells, which of the
following occurs when electrons flow cyclically
through the electron transport chain associated
with photosystem I?
12
16. In the presence of alcohol dehydrogenase, the rate
of reduction of acetaldehyde to ethanol increases
as the concentration of acetaldehyde is increased.
Eventually, the rate of the reaction reaches a
maximum, after which point further increases in
the concentration of acetaldehyde have no effect.
Which of the following is true at the maximal rate
of reaction?