Males of some animal species have a display area where they compete for reproductively available females. This area
is known as a:
a. lek.
b. home range.
c. pride.
d. territory.
e. hive.
a
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Classic experiments suggested that a floral stimulus, florigen, could move across a graft from an induced plant to a noninduced plant and trigger flowering
Recent evidence using Arabidopsis has recently shown that florigen is probably _____. A) a phytochrome molecule that is activated by red light B) a protein that is synthesized in leaves, travels to the shoot apical meristems, and initiates flowering C) a membrane signal that travels through the symplast from leaves to buds D) a second messenger that induces Ca++ ions to change membrane potential E) a transcription factor that controls the activation of florigen-specific genes
Color vision in vertebrates is made possible by:
A. cone cells. B. rod cells. C. amicrine cells. D. ganglion cells.
In a cell with a diploid number of 12, how many chromatids are present at prophase of mitosis?
A) 6 B) 12 C) 24 D) 48 E) none of the above
Systemic involvement is rare in infection caused by Ancylostoma braziliense or Ancylostoma caninum; however, pneumonitis may occur. The antihelminthic therapy used to treat this infec-tion is:
a. ivermectin or thiabendazole. b. metronidazole or thiabendazole. c. mebendazole or ivermectin. d. albendazole or diethylcarbamazine.