Transcription begins near a site in the DNA called the
A. promoter
B. transcription unit
C. enhancer
D. regulatory sequence
E. response element
Answer: A
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A neuron sends information across a chemical synapse by
a. movement of sodium ions from the first cell through the membrane of the second. b. electrons from the first cell that induce permeability changes in the second. c. neurotransmitter molecules that penetrate into the second cell. d. fusion of the plasma membrane of the first cell with the membrane of the second. e. neurotransmitter molecules that bind to membrane receptors on the second cell.
A species of cattail inhabits both deep and shallow water in the absence of a competitor but only shallow water in the presence of it. This is an example of
A) a realized niche. B) a fundamental niche. C) carrying capacity. D) coevolution.
When a human embryo is implanted in the uterus, the embryo is in the morula stage
____________________ Indicate whether the statement is true or false.
Which term from the Hardy-Weinberg equilibrium represents the frequency of the homozygous dominant genotype?
a. pq b. p 2 c. 2pq d. q 2