Plasma membranes are a feature of
all cells.
prokaryotic cells only.
eukaryotic cells only.
plant cells only.
animal cells only.
all cells.
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Place the following events of bacterial conjugation in order from first to last.
1 - DNA replication 2 - an enzyme joins F factor DNA ends 3 - sex pilus shortens 4 - DNA transfer 5 - an enzyme cuts F factor DNA A. 1, 2, 3, 4, 5 B. 3, 5, 4, 2, 1 C. 5, 1, 3, 4, 2 D. 3, 5, 1, 4, 2 E. 3, 5, 1, 2, 4
The concentration of nitrogen in the earth’s
atmosphere is approximately a. 48 percent. b. 58 percent. c. 68 percent. d. 78 percent. e. 88 percent.
Which of the following makes its own food using energy and simple raw materials it obtains from nonbiological sources?
A. Producer B. Nutrient C. Consumer D. Cell E. Protist
Which of the following statements about RNAi is true?
(a) The RNAi mechanism is found only in plants and animals. (b) RNAi is induced when double-stranded, foreign RNA is present in the cell. (c) RISC uses the siRNA duplex to locate complementary foreign RNA molecules. (d) siRNAs bind to miRNAs to induce RNAi.