Ribosomes function as
a. 1 unit.
b. 2-part units.
c. 3-part units.
d. 4-part units.
e. a multidivisional unit.
B
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The ability of two nucleic acid strands, a probe and a target, which have complementary base sequences that specifically bond with each other and form a double-stranded molecule, drives which of the following methods?
a. Hybridization b. Sequencing c. Amplification (PCR) d. Genotypic
30. In meiosis, homologous chromosomes separate during
A. prophase II. B. anaphase I. C. prophase I. D. anaphase II. E. metaphase I.
According to pressure-flow theory, how does sap move from the sieve tube into a sink?
A. a positive pump pressure B. osmosis of the dissolved sugars across the sieve tube and the sink plasma membranes C. a negative pump pressure D. gravitational action as phloem moves down from the source E. active membrane transport through the plasma membranes
What happens immediately following the closing of the sodium gates during an action potential?
a. Sodium ions enter the cell. b. Sodium ions leave the cell. c. Potassium ions enter the cell. d. Potassium ions leave the cell. e. Calcium ions leave the cell.