Under what circumstance would your body experience an increase in erythropoietin secretion?
A. If your hematocrit is elevated above normal levels
B. After drinking 5 liters of water in just 2 hours
C. If you are suffering from dehydration
D. If you just moved from New York City to start training for a marathon in the "Mile-High" city of Denver, Colorado
E. If you are suffering from hypertension
Answer: D
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The observation that different geographical areas sometimes exhibit plant and animal communities of similar appearance, even though the individual plants and animals are not closely related, is called
A. the fossil record. B. homology. C. convergent evolution. D. divergent evolution. E. adaptation.
Phenotypic differences between humans and chimpanzees may be better explained by the time during development when genes are turned on in humans and chimpanzees, than by genetic differences themselves
A. true B. false
How does cAMP affect the expression of the lac operon?
A. cAMP binds to the CRP, decreasing its affinity for a DNA site near the promoter. B. cAMP binds to the CRP, increasing its affinity for a DNA site near the promoter. C. cAMP binds to the Lac repressor, decreasing its affinity for a DNA site near the promoter. D. cAMP binds to the Lac repressor, increasing its affinity for a DNA site near the promoter.
How many different kinds of nucleotides are in DNA?
A) Four B) Two C) Hundreds or thousands D) Millions