Integrins couple the matrix outside a cell to the cytoskeleton inside It.
a. true
b. false
Ans: a. true
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Neurotransmitters are stored in vesicles at the nerve terminal. Assuming a neurotransmitter is a protein, where was it synthesized?
A. the cytoplasm B. the rough endoplasmic reticulum C. the Golgi apparatus D. the lysosome
What property defines most ligands for intracellular receptors?
A. They are lipid-soluble B. They are hydrophilic C. They are molecules that can perform significant hydrogen bonding interactions with water D. They are large molecules
A long-term study on guppies illustrates the effect of predation on life history traits. In this study, what occurred when guppies from streams with cichlids (prey on larger guppies) were moved to streams with killifish (prey on smaller guppies)?
a. Guppies became larger in one generation. b. Guppies became smaller in one generation. c. Guppies became larger over several generations. d. Guppies became smaller over several generations. e. Guppies did not change size.
The exact path that led to the evolution of modern cells and the organic molecules contained in these cells to support life is not known
The best guess is that some sort of self-replicating organic molecule formed along mudflats and most likely resembled A) single-stranded DNA. B) single-stranded RNA. C) small amino acids such as lysine and glycine. D) double-stranded DNA. E) ATP.