A gene for sweat gland production is found on the X chromosome. If a man who lacks sweat glands marries a woman who has normal sweat glands, what will be the phenotype of their children?
A. All of the boys will lack sweat glands.
B. All of the girls will lack sweat glands.
C. The girls will have sweat glands in some areas, but lack sweat glands in others.
D. All of the boys will have sweat glands.
E. All the boys will have sweat glands, and the girls will have sweat glands in some areas but not others.
E. All the boys will have sweat glands, and the girls will have sweat glands in some areas but not others.
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If a C3 plant that normally closes its stomata during hot, dry conditions were triggered to open them instead, the most likely outcome would be that
A. CO2 enters the leaf, decreasing the rate of photosynthesis. B. More chlorophyll is made, increasing the rate of photosynthesis. C. Glucose leaves the leaf, increasing the rate of photosynthesis. D. O2 enters the leaf, increasing the rate of photosynthesis. E. Water leaves the leaf, decreasing the rate of photosynthesis.
Which of the following is NOT one of Mendel's hypotheses to explain the results of his P, F1 and F2
crosses?
a. Adult plants carry a pair of genes that will determine the inheritance of each allele. b. If an adult plant has two different alleles, one is dominant over the other. c. Adult plants always have traits that are governed by a single pair of alleles, but the number of possible alleles varies with each trait. d. The pairs of alleles separate in the formation of gametes so that each gamete gets one allele of the pair. e. If an adult plant has two different alleles, one is recessive to the other.
Mitochondria differ from chloroplasts in that mitochondria
A) convert light energy from the sun to chemical energy, whereas chloroplasts convert one form of chemical energy to another.
B) contain three different membrane-bound compartments, whereas chloroplasts contain two.
C) contain membrane folds called cristae, whereas chloroplasts contain disklike vesicles in stacks called grana.
D) are not found in plants, whereas chloroplasts are not found in animals.
The ratio between the uptake of carbon dioxide by photosynthesis and the release of carbon dioxide by respiration is approximately
A. 0.5 (i.e., half as much carbon dioxide is taken up by photosynthesis as is released by respiration). B. 5 (i.e., five times as much carbon dioxide is taken up by photosynthesis as is released by respiration). C. 0.1 (i.e., one-tenth as much carbon dioxide is taken up by photosynthesis as is released by respiration). D. 2 (i.e., twice as much carbon dioxide is taken up by photosynthesis as is released by respiration). E. 1 (i.e., about the same).