Tumor suppressors are genes that __________
A) promote advancement of the cell cycle
B) phosphorylate proteins involved in the cell cycle
C) block progression of the cell cycle
D) prevent apoptosis in normal cells
E) activate proto-oncogenes
C
You might also like to view...
In multicellular organisms, the mechanism most directly responsible for directing development and maintaining homeostasis is gene
A. mutation. B. duplication. C. deletion. D. regulation.
Which of the following statements is true regarding hormones? Select all correct choices
A. They can act over long distances in the body. B. They can act as neurotransmitters. C. They can act as transcription factors (in conjunction with proteins). D. They can produce effects with very small concentrations. E. They can be transported through the bloodstream.
Unlike all other amine derived hormones, thyroid hormones
A. bind to membrane receptors to elicit a response. B. activate second messengers via binding to a membrane receptor. C. are derived from cholesterol. D. are produced by the gonads. E. bind to intracellular receptors rather than to membrane-bound receptors to elicit a response.
Similar body parts are not always homologous
They may have evolved independently in separate lineages as adaptations to the same a. reproductive isolation of these groups. b. environmental pressures. c. reduced genetic variability in these groups. d. identical genes in all three groups. e. factor as all of these