A horticulturist is breeding a new variety of houseplant in which two genes control leaf color. G (allele for green) is dominant to g (yellow) and B (second allele for green) is dominant to b (yellow). The recessive homozygous condition of either gene will mask a dominant allele. What color is a plant with the genotype GgBb? rev
A. green
B. yellow
C. an intermediate yellow-green
D. variegated (yellow and green spots or stripes)
E. The color cannot be determined with the information given.
A. green
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Oxytocin and cholecystokinin are transported through the bloodstream and arrive at the uterus at the same time. Oxytocin causes the uterus to contract, whereas cholecystokinin has no effect. Why?
A. The uterus has receptors for oxytocin, but not for cholecystokinin. B. Oxytocin blocks the activity of cholecystokinin. C. Oxytocin alters gene expression patterns, whereas cholecystokinin does not. D. Oxytocin is able to diffuse through the plasma membrane of uterine cells, whereas cholecystokinin cannot. E. Oxytocin is at a higher concentration in the bloodstream than cholecystokinin.
Select the correct meaning for the following pedigree symbol.
A) Unaffected male
B) Unaffected female
C) Mating
D) Affected male
E) Affected female
The organism Plasmodium falciparum causes malaria. In which type(s) of human cell(s) does it infect and grow?
A. liver and red blood cells B. intestinal cells C. liver and intestinal cells D. red blood cells E. liver cells
Which one of the following characteristics applies to both living organisms and nonliving things?
A) composed of matter B) capable of reproduction C) capable of storing energy for later use D) capable of growth E) composed of cells