What action results when activators present near a gene are "turned on"?
A) increased transcription
B) decreased gene expression
C) unwinding of the DNA double helix
D) a shift in the reading frame
A
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The presence of altruistic behavior is most likely due to kin selection, a theory maintaining that _____
A) aggression between sexes promotes the survival of the fittest individuals B) genes enhance survival of copies of themselves by directing organisms to assist others who share those genes C) companionship is advantageous to animals because in the future they can help each other D) critical thinking abilities are normal traits for animals and they have arisen, like other traits, through natural selection E) natural selection has generally favored the evolution of exaggerated aggressive and submissive behaviors to resolve conflict without grave harm to participants
The TCA cycle generates all of the following from each acetyl-CoA molecule oxidized except
A. two ATP or GTP molecules. B. one FADH2 molecule. C. three NADH molecules. D. two CO2 molecules.
True or False: Microorganisms dominated Earth's ecosystems for most of the planet's history
A. true B. false
In cardiovascular disease, "MI" refers to
A. high blood cholesterol. B. a heart attack. C. a stroke. D. narrowed arteries.