Before differentiation can begin during the processes of plant cell and tissue culture, parenchyma cells from the source tissue must
a. differentiate into procambium.
b. undergo dedifferentiation.
c. increase the number of chromosomes in their nuclei.
d. enzymatically digest their primary cell walls.
e. establish a new polarity in their cytoplasm.
Ans: b. undergo dedifferentiation.
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Dopamine derived from the hypothalamus is the prominent hormone controlling pituitary prolactin secretion. Dopamine inhibits prolactin secretion. What do you predict would happen if the pituitary were removed from the base of the brain and transplanted to some distant place in the body (for instance on top of the kidney), such that dopamine could no longer regulate prolactin secretion? You can assume that the transplanted pituitary will be exposed to a ready supply of blood vessels.
A. Dopamine secretion would increase. B. Dopamine secretion would decrease. C. Prolactin secretion would decrease. D. Prolactin secretion would increase. E. Both dopamine and prolactin secretion would decrease.
Officials associated with international track and field competitions have noted an increase in the number of athletes who use a synthetic form of erythropoietin. Athletes use this drug because it
A) stimulates the release of ADH, which then goes on to cause an increase in the number of red blood cells and helps athletes increase their aerobic capacity for an event. B) increases urine output so that they can shed weight just prior to an important competition. C) increases the number of oxygen-transporting red blood cells, which helps athletes increase their aerobic capacity for an event. D) decreases blood pressure so that they can be more focused and relaxed during a competition.
The use of lysozyme during the preparation of cheeses and wines is effective in reducing the numbers of
A) fungi. B) viruses. C) bacteria. D) prions. E) all microbes.
Scientists estimate that about ________ of the world's eukaryotic organisms have been discovered and given scientific names.
A. 15% B. 40% C. 5% D. 90% E. 1%