When red blood cells interact with tissue where the oxygen concentration is low, hemoglobin ____
a. releases oxygen
b. releases carbon dioxide
c. binds oxygen
d. breaks down carbon dioxide
e. releases both oxygen and carbon dioxide
ANSWER: a
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In warm and temperate waters, common phytoplankton are the
a. diatoms. b. radiolarians. c. coccolithophores. d. dinoflagellates. e. salps.
In an imagined transduction experiment with alleles a+, b+, and c+, a+ alone was transduced into an auxotroph 1400 times, b+ alone 1200 times, and c+ alone 970 times
Genes a+ and b+ were both found 10 times, b+ and c+ 2 times, and a+ and c+ one time. What can you conclude? A) Cotransduction is too infrequent to be used to map genes. B) Genes a and c cotransduce only accidentally. C) Genes a and b are more closely linked than a and c or b and c. D) Genes a and c are found together only if double crossovers have occurred. E) Transduction of gene c is very rare.
Look at Figure 8-1. All the following are parts of an ADP molecule EXCEPT
a) structure A. b) structure B. c) structure C. d) structure D.
Amoxicillin is very effective for treating infections with Gram-positive bacteria but rarely causes side effects in humans. This is an example of
A) selective toxicity. B) narrow spectrum of action. C) a broad-spectrum antimicrobial. D) antibiotic resistance. E) altruism.