The migratory patterns of many animals
encourage
a. a bottle neck.
b. mutation.
c. a founder effect.
d. gene flow.
e. genetic drift
D
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The major function of a receptor is to _____
a. control the autonomic functions of the body b. stabilize the internal environment to achieve homeostasis c. produce responses to the various stimuli the body receives d. give organisms or cells awareness of and sensitivity to their environment e. control the visceral functions of the body
Despite an international agreement signed in 1987 to phase out the production of CFCs, depletion of the ozone will continue to affect Earth and its atmosphere for at least another one hundred years
Indicate whether the statement is true or false
Experiments have demonstrated that the "words" of the genetic code (the units that specify amino acids) are
A) single nucleotides. B) two-nucleotide sequences. C) three-nucleotide sequences. D) nucleotide sequences of various lengths.
Marine mammals are unable to breathe air during periods of prolonged diving. To enable such feats, in relation to their muscle physiology, they have
A. increased myoglobin concentrations. B. increased capillary densities. C. increased amounts of sarcoplasmic reticulum. D. increased expression of acetylcholine receptors. E. All of the choices for this question are correct.