One advantage of gas exchange in water is that
A) water can contain more oxygen than air.
B) carbon dioxide is easier to eliminate in water than in air.
C) it is easy to keep the exchange surface wet.
D) ventilating gills in water requires very little energy.
Answer: C
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Inbreeding depression is caused by:
a. a reduction in fitness caused by deleterious recessives b. random mating c. mutation-selection balance. d. A and B. e. All of the above.
When Lederberg and Tatum performed their experiments on gene transfer in bacteria that lead to our understanding of conjugation, what were their controls?
A) They mixed strains A and B together. B) They put strain A on one side of a U-shaped tube and strain B on the other, with a filter between them. C) They found bio- met- cells. D) They plated strain A and strain B separately onto minimal media plates to screen for spontaneous prototrophs. E) They observed mating bridges with transmission electron microscopes.
Primates, as well as dogs, sheep, and horses, have died of central nervous system (CNS) infections with which organism?
a. N. fowleri b. Acanthamoeba spp. c. Toxoplasma gondii d. Balamuthia mandrillaris
Which of the following is NOT true of an
apical meristem?
a. the cells are undifferentiated b. it changes position as the plant increases in size c. growth from apical meristems is called primary growth d. it is responsible for the lengthening of the plant e. all of these are true of apical meristems