The male peacock's beautiful tail is really a trade-off between
A) sexual selection and natural selection. B) disruptive selection and natural selection.
C) natural selection and genetic drift. D) artificial selection and natural selection.
A
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In the Gram-staining procedure, the decolorizer is
A. crystal violet. B. ethanol or acetone. C. safranin. D. iodine.
These two homologous chromosomes have ___ alleles in common and differ by ___ alleles
1.1, 3
2.2, 2
3.3, 1
4.4, 0
The extracellular matrix outside the plasma membrane of animal cells is typically composed of
A) collagen and proteoglycans. B) lipids. C) cellulose. D) peptidoglycan. E) collagen, proteoglycans, lipids, and peptidoglycan.
________ play important roles in maintaining the blood-brain barrier.
A. nodes of Renvier B. oligodendrocytes C. microglia D. astrocytes