Second messengers:
A. are small intracellular molecules that
participate in signal transduction.
B. play a role in activation of intracellular
signal transduction.
C. are removed in order to terminate a
cellular signaling response.
D. amplify the effects of the signal.
E. All of these choices are correct.
E
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Why is the formation of a BCR-ABL fusion gene a carcinogenic event?
A. The tyrosine kinase activity of the ABL gene becomes inactive. B. The tyrosine kinase activity of the ABL gene is now controlled by a weak promoter resulting in less tyrosine kinase activity. C. The tyrosine kinase activity of the ABL gene becomes unregulated leading to uncontrollable cell division. D. The tyrosine kinase activity of the ABL gene is reduced due to truncation of the protein product. E. The tyrosine kinase activity of the BCR gene is increased in the fusion protein product.
What is the frequency of the S1 allele in the population before the asteroid hit?
A) 0.15 B) 0.40 C) 0.50 D) 0.60 E) 0.80
Coevolution between predator and prey suggests
A) as prey decrease in number, predators will switch prey. B) as predators become smarter at catching prey, prey will become smarter at escaping predation. C) as predators feed on prey, prey will become more palatable over time. D) as predators drive down prey populations, they become worse at catching prey.
When the solute concentration of solution A is lower than the solute concentration of solution B, solution A is considered
A. hypertonic. B. isotonic. C. hypotonic.