The major class(es) of antibiotics that inhibit protein synthesis is/are
A. aminoglycosides.
B. tetracyclines.
C. macrolides.
D. bacitracins.
E.
aminoglycosides, tetracyclines, AND macrolides.
E
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For a span of some 300 million years, the Paleozoic era, in which vascular plants, fishes, and other diverse life appeared, lasted approximately ___ of the geologic timescale.
A. 7% B. 15% C. None of the answer choices is correct. D. 50% E. 85%
Explain why transplanted organs are often rejected by their hosts. What will be an ideal response?
Which of the following statements does NOT describe an essential element?
a. An element with only one role in plant metabolism may still be essential. b. An essential element is necessary for normal growth and reproduction. c. Plant seeds in some cases contain enough of an essential element to sustain the adult plant. d. An essential element may occasionally be functionally replaced by another element
Which of the following could alter the level of expression of a gene?
A. an increase in environmental temperature B. an increase in salinity C. exposure to UV radiation D. presence of a particular energy substrate E. All of the choices are correct.