Treating young plants with gibberellins is likely to cause them to ________
a. lose leaves
b. close stomata
c. slow their growth
d. grow abnormally tall
d
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Seals and penguins both have streamlined body forms that allow them to move through water efficiently. This similarity in body shape is mostly likely the result of:
A. convergent evolution. B. shared ancestry. C. homology. D. phylogeny. E. cladistics.
When some members of a group of organisms adapt to a new general way of life, they are said to be
entering
a. a new niche b. an adaptive zone c. an adaptive radiation d. a new habitat e. a period of punctuated equilibrium
The diploid portion of a plant life cycle is known as the:a
parental generation. b. sporophyte generation. c. daughter generation. d. gametophyte generation. e. reproductive generation.
Which statement about HIV is FALSE?
a. HIV infection results in a dramatic decline in the T helper cell population. b. The first cells targeted by HIV are dendritic cells. c. T cytotoxic cells are the main cells that attack HIV. d. Dendritic cells transport HIV from the mucosa to the lymph nodes. e. HIV attaches to the CD4 component of TH cells.