An action potential is propagated down an unmyelinated neuronal plasma membrane because it stimulates voltagegated
____ channels adjacent to it. (Choose the most accurate answer.)
a. Na+
b. Ca2+
c. K+
d. Na+ and Ca2+
e. K+ and Ca2+
ANSWER: a
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In bacteria, which topoisomerase is responsible for unlinking catenated chromosomes after replication?
A. topoisomerase I B. topoisomerase II C. topoisomerase III D. topoisomerase IV E. topoisomerase V
____________ is a segment of a chromosome that controls a specific function
a. DNA b. RNA c. An enzyme d. A gene e. An amino acid
Which type of microscope bombards a whole, metal-coated specimen with electrons moving back and forth over it?
A. Phase-contrast B. Transmission electron C. Fluorescence D. Differential interference contrast E. Scanning electron
The process that releases digestive enzymes is
a. absorption. b. assimilation. c. secretion. d. digestion. e. elimination.