The megaspore produces a gametophyte with ____ cells.
A. 2
B. 7
C. 8
D. 14
E. 16
Answer: B
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What happens when action potentials stimulate a muscle at a rate that does not allow relaxation between contractions?
A. The strength of contraction decreases with subsequent stimuli. B. The strength of contraction increases with subsequent stimuli. C. The strength of contraction does not change. D. More motor units are recruited.
The invasion and multiplication of a pathogen in the human host is referred to as a(n) ______
Fill in the blank(s) with the appropriate word(s).
A replication fork:a
is only seen in prokaryotic chromosomes. b. is only seen in bacterial cells. c. is a Y-shaped structure where both DNA strands are replicated simultaneously. d. is a site where one DNA strand serves as a template, but the other strand is not replicated. e. is created by the action of the enzyme RNA polymerase.
Bacterial smears are fixed before staining to
A) affix the cells to the slide. B) make their walls permeable. C) accept stain. D) make the cells visible.