Which of the following statements is true regarding the sexual life cycle of basidiomycetes? Select all correct choices
A. Spore precursor cells undergo meiosis
and mitosis to form spores.
B. Spore precursor cells only undergo
meiosis to form spores.
C. Spore precursor cells only undergo
mitosis to form spores.
D. Fruiting bodies are composed of both
haploid (1n) and dikaryotic (n+n) cells.
E. Fruiting bodies are only composed of
dikaryotic cells (n+n).
B,E
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The situation in which an active regulatory protein "turns on" gene expression is an example of
A) feedback inhibition. B) positive control. C) negative control. D) constitutive gene elements. E) a mutation.
Cleavage produces a __________ stage cell. Fill in the blank(s) with the appropriate word(s)
If the frequency of expression of a recessive trait in a population is 16 percent, the frequency of the recessive allele is what percent?
A. 16 B. 25 C. 40 D. 50 E. 67
The actual process of cell division in eukaryotic cells is called
A. meiosis. B. mitosis. C. binary fission. D. cytokinesis.