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
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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
Discuss some of the differences between organisms in the domains Bacteria and Archaea
What will be an ideal response?
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.
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.