Plants, unlike most animals, can occasionally form new species in one generation. The mechanism by which this happens is
A. numerous mutations happening at once in an organism.
B. isolation.
C. punctuated equilibrium.
D. a doubling or a tripling of the chromosome numbers.
D. a doubling or a tripling of the chromosome numbers.
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Define the Oparin-Haldane hypothesis and explain how it has been tested in a laboratory
What will be an ideal response?
An organism acquires a mutation in the gene for pyruvate dehydrogenase that renders the protein unable to bind NADH. What is the most likely consequence of this mutation?
A. Substrate level phosphorylation will cease to occur. B. Fats will be oxidized at a higher rate than normal. C. Pyruvate oxidation will cease to occur. D. ATP synthesis will proceed at a high rate even when the cell has an ample supply. E. Pyruvate will not be able to enter the mitochondria.
Sunlight energy drives moisture-laden air aloft at _________ north and south latitude, bringing rains to temperate zone forests.
A. 21 degrees B. 40 degrees C. 60 degrees D. 75 degrees E. 90 degrees
When the directions for a fetal pig dissection refer to the left, they are referring to
a. your left. b. the pig's left. c. the pig's right. d. both a and c.