In the model of a bacteriorhodopsin, which pigment is bound to the protein?
a. rhodopsin
b. retinal
c. chlorophyll a
d. indigo
Ans: b. retinal
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A point mutation that now codes for the wrong amino acid is called a:
A. missense mutation. B. nonsense mutation. C. silent mutation. D. frameshift mutation.
Ecologists have documented the extinction over the last 20 years of ________ of the 110 species of harlequin frogs (Atelopus) native to tropical America.
A. 67% B. 100% C. 15% D. None of the choices are correct.
Phylogenetic trees constructed from evidence from molecular systematics are based on similarities in _____
A) morphology B) the pattern of embryological development C) biochemical pathways D) mutations to homologous genes
Nervous system effector cells
A) are white blood cells found in the circulatory system. B) consist of sensory cells. C) include muscle cells and gland cells. D) provide automatic responses to stimuli.