The progesterone receptor (PR) is a steroid hormone receptor and transcription factor. The protein SRC-1, which does not bind DNA by itself, can bind to PR and increase expression of genes regulated by PR. Based on this information, SRC-1 is best described as a(n)
A. inducer.
B. general transcription factor.
C. specific transcription factor.
D. coactivator.
Answer: D
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Nongrowing cells continuously degrade and resynthesize cellular molecules during a process known as cellular turnover.
Answer the following statement true (T) or false (F)
Reznick and Endler were interested in the effects of
__________ on guppy evolution. a. predation b. competition c. population density d. density-independent factors e. mating rituals
Antibodies are
A. specific molecules, or parts of molecules, that the body recognizes as foreign B. cells that protect the body against invaders C. enzymes secreted to destroy a pathogen's cell wall D. proteins the body produces against invading substances E. proteins on the surface of our cells to which pathogens attach
The age at maturity is the age at which an organism ______________________.
a. completes embryonic development b. starts to reproduce c. is killed or dies d. leaves its parents e. I don't know the answer