An unlabeled signaling diagram for steroid hormones: Fig. 11.8 p. 213, Campbell 8e. A steroid hormone, like estrogen, passes through the plasma membrane and binds to an intracellular protein as shown in the diagram below
This activates a signal-transduction pathway which results in an increased production of a specific protein. Which of the following statements would explain what would occur as a result of the signal pathway represented by the diagram? A) Transfer RNA (t-RNA) would accumulate in high levels because it is not required for protein synthesis.
B) Ribosomal RNA (r-RNA) levels would increase because ribosomes are specific for the messenger RNA (m-RNA) with which they bind during transcription of the polypeptide.
C) DNA levels would increase in the nucleus as a result of the binding of the hormone-receptor complex with the DNA.
D) Messenger RNA (m-RNA) levels would increase in order to be translated into the protein required by the cell.
D
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A mutation causes a gene to become overactive, contributing to uncontrolled cell growth. Which term best describes this gene?
A. tumor-suppressor gene B. oncogene C. spliced gene D. alternatively spliced gene E. malignant gene
For an autosomal gene locus, there are ____ possible genotypes and ____ possible alleles
a. two; three b. two; four c. three; two d. three; four e. four; three
The fly on the right has a mutation in a(n)
1.master gene.
2.activator.
3.enhancer.
4.homeotic gene.
The tetanus toxin blocks the release of __________
and glycine from certain neurons, causing muscle __________ and death from __________ and cardiac failure. a. GABA; spasms; respiratory b. ACh; spasms; respiratory c. GABA; relaxation; digestive d. ACh; relaxation; digestive e. GABA; relaxation; respiratory