Which of the following statements regarding ferns is true?
A) Ferns are most diverse in grassland environments.
B) Ferns have well-developed roots and rigid stems.
C) Ferns produce seeds that are dispersed by water.
D) Ferns produce pollen that is dispersed by air.
Answer: B
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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
A mass extinction, in which the dinosaurs disappeared from Earth, occurred approximately ____ years ago
a. 6500 b. 65,000 c. 650,000
d. 65,000,000 e. 650,000,000
In most organisms, the flow of information is from
A. protein, DNA, then RNA. B. DNA, RNA, then protein. C. RNA, DNA, then protein. D. protein, RNA, and DNA.
Trypanosoma is a protistan parasite that causes ________ in humans
Fill in the blank(s) with correct word