Crossing-over occurs in
A. prophase I.
B. prophase II.
C. metaphase II.
D. Both prophase I and II.
A. prophase I.
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Explain why one cell of a pathogenic bacterium by itself typically does not secrete a toxin, despite the species as a whole being characterized as toxin producing
To help in your explanation, predict what would happen to an individual pathogen that secreted a toxin inside a human. What will be an ideal response?
The processes that plants use to move water, sugar, and other solutes through their bodies involves
primarily
a. cohesion and evaporation. b. evaporation and pumps. c. capillary action and pumps. d. positive pressure from roots and cohesion. e. capillary action and positive pressure from roots.
Blood in arteries
1.always travels away from the heart. 2.travels away from the heart only if it is oxygen-rich. 3.always travels toward the heart. 4.travels from the lungs. 5.is always oxygen-rich.
Speciation occurs more often between allopatric populations than it does between sympatric populations.
a. true b. false