Hair follicles are a variation of ________ tissue
A) loose connective
B) dense connective
C) nerve
D) muscle
E) epithelial
E
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A hypothetical endangered species of wildflower has been reduced to a single small population in a mountain meadow. A rare early spring blizzard kills all but 3 of the remaining plants, one of which has a rare mutation. This is an example of:
A. natural selection. B. sexual selection. C. genetic drift/bottleneck. D. genetic drift/founder event. E. None of the answer options are correct.
Gases enter and leave a mammal's body by diffusing across a:
a. membrane made up of multiple cell layers b. hard exoskeleton c. thin, moist membrane d. set of gills e. protective layer of thick cells
A single contraction of all the muscle fibers in a motor unit is known as ____
a. a muscle twitch b. tetanus c. summation d. relaxation coupling e. isometric contraction
Phenylketonuria is an inherited disorder. Affected individuals have a defective enzyme called phenylalanine hydroxylase. The substance that these individuals cannot break down is a(n):
A) carbohydrate. B) nucleic acid. C) protein. D) lipid. E) amino acid.