Which of the following processes does NOT
serve to maintain low pressure at the receiving
end of sieve tube pipelines?
a. sucrose conversion into cell-wall
polysaccharides
b. sucrose conversion into starch in the
receiving regions
c. sucrose conversion to glucose, which is
then used in cellular respiration
d. activity of companion cells
e. conversion of sucrose to fructose in fruits
D
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The brain knows how strong a stimulus is
because the brain interprets
a. action potentials of certain nerves in certain ways. b. variations in the rate of action potentials. c. the size variation in the action potential being propagated. d. all of these. e. all of these except size variation in the action potential being propagated
Oral infections with herpes simplex virus 1 can lie dormant in nerve cells for years, and when a patient becomes stressed, the virus is released, forming cold sores on the lips. Why would the virus form a cold sore?
a. To allow it to spread to a new host b. So that it can mutate and survive an antibiotic treatments c. To move to another part of the body d. To avoid the immune system e. To warn other people that the host is infected
Net primary productivity represents:a
the rate at which energy is captured during photosynthesis. b. the amount of biomass in excess of that needed to support plant cell respiration. c. the amount of carbon dioxide produced by plants. d. plant reproduction per unit area per unit time. e. energy production in an area per unit time.
The drug cytochalasin B blocks the function of actin. Which of the following aspects of the cell cycle would be most disrupted by cytochalasin B?
A) spindle formation B) spindle attachment to kinetochores C) cell elongation during anaphase D) cleavage furrow formation and cytokinesis