Some enveloped animal viruses enters a host cell by
A. injecting their DNA or RNA into the host cell.
B. fusion of their envelope with the host cell's plasma envelope.
C. endocytosis.
D. All of the above.
E. Both B and C.
Answer: E
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Which macromolecule has the highest diversity of functions?
A. carbohydrates B. proteins C. nucleic acids D. lipids E. glycolipids
Which of the following elements cannot be utilized directly from the atmosphere by plants?
a. carbon b. nitrogen c. oxygen d. phosphorus
The hypothesis that high pressure forces phloem sap to flow was tested and supported by studies using
a. caterpillars. b. radiolabeled hormones. c. vacuum chambers. d. aphids. e. radiolabeled sugars.
It is hypothesized that the high diversity of rock-dwelling species within the cichlids is due to:
a. allopolyploidy. b. poor water quality. c. polyploidy coloration. d. disruptive sexual selection. e. macroevolution