In the regulation of the trp operon, tryptophan acts as a(n)
A) repressor.
B) attenuator.
C) activator.
D) effector.
E) operator.
D) effector.
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a) prolactin b) follicle-stimulating hormone c) adrenocorticotropic hormone d) thyroid-stimulating hormone
Traits which by logic should show less genetic variation because of their close association with reproduction fall into which category?
A) life-history traits B) behavioral traits C) physiological traits D) morphological traits
Why do freshwater fish die in salt water
What will be an ideal response?
Which of the following statements about the greenhouse effect is true?
A) The greenhouse effect is reduced by deforestation. B) The greenhouse effect is exacerbated by the use of fossil fuels. C) The greenhouse effect will decrease the average temperature of the planet. D) The greenhouse effect decreases plant growth.