Most deserts occur near ____ latitude because of the presence of dry descending air masses
a. 0
ANSWER: d
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Alkaloids are considered "expensive" defense compounds to produce because:
A. they contain a lot of carbon, which is costly for plants to concentrate. B. they vaporize readily, so they constantly have to be synthesized. C. they contain nitrogen, an essential and often limiting element plants need. D. they often function in very small concentrations. E. they contain proteins, which are very costly for a plant to produce.
Which statement about the structure of RNA is true?
a. RNA is a double-stranded helix. b. RNA nucleotides contain cytosine and guanine. c. RNA nucleotides contain thymine and adenine. d. Deoxyribose is the five-carbon sugar in RNA.
Which of the following female organisms do
NOT contain XX chromosomes?
a. humans b. fruit flies c. cows d. butterflies e. cats
Post-translational modifications are responsible for
a. activation, inhibition, and stabilization of enzymes. b. inhibition of enzymes only. c. activation, inhibition, and synthesis of enzymes. d. synthesis of enzymes and allosteric enzyme control. e. synthesis of enzymes only.