Some dinoflagellates have the enzyme luciferase, which hydrolyzes ATP to ________
a. produce a toxin
b. power bioluminescence
c. cause flagella to rotate
d. fix carbon during photosynthesis
b
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An antimicrobial drug that inhibits the growth of bacteria without affecting the growth or function of cells in the human host is described as being ________.
Fill in the blank(s) with the appropriate word(s).
In birds, sex is determined by a ZW chromosome scheme that is much like the typical XY scheme seen in humans and many other organisms, except that the system is reversed:
Males are ZZ (similar to XX in humans) and females are ZW (similar to XY in humans). A lethal recessive allele that causes death of the embryo occurs on the Z chromosome in pigeons. What would be the sex ratio in the offspring of a cross between a male heterozygous for the lethal allele and a normal female? A) 1:1 male to female B) 3:1 male to female C) 1:2 male to female D) 2:1 male to female
How do monotremes differ from other mammals?
A) They lay eggs. B) They have hair. C) They have claws. D) They have a four-chambered heart. E) They do not produce milk.
The two hormones involved in seed germination and seed dormancy are
A) auxin and ethylene. B) gibberellin and auxin. C) ethylene and cytokinin. D) abscisic acid and gibberellin. E) cytokinin and auxin.