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. specific transcription factor.
B. coactivator.
C. inducer.
D. general transcription factor.


Answer: B

Biology & Microbiology

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A point mutation that causes no change in the amino acid sequence of a protein is called a _____

A. synonymous (silent) mutation B. nonsynonymous (missense) mutation C. nonsense mutation D. stop mutation E. transition mutation

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Discuss some of the differences between organisms in the domains Bacteria and Archaea

What will be an ideal response?

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Double fertilization in an angiosperm produces

A. a triploid embryo and a diploid endosperm. B. a diploid zygote and a triploid endosperm. C. a diploid zygote and a haploid polar nucleus. D. a diploid embryo and a triploid zygote. E. a diploid zygote and a diploid endosperm.

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The most abundant protein in the world is the enzyme that initiates the fixation of carbon in the Calvin cycle. This enzyme is called:

a) ADP-synthase. b) crassulacean acid. c) rubisco. d) ribulose biphosphate. e) glyceraldehyde 3-phosphate.

Biology & Microbiology