Highly acidic gastric secretions are kept from leaking out of the stomach by
a. desmosomes.
b. tight junctions.
c. adhering junctions.
d. gap junctions.
e. intercalated discs.
B
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Cheetahs have been through a genetic bottleneck; evidence for this is that
A. the body is long, thin, and graceful. B. these cats are members of an endangered species. C. there is very little genetic variability. D. little natural selection occurs in this species. E. they originally came from small areas of Africa.
Five two-point crosses involving the four linked genes A, B, C, and D were performed in yeast with the following results:
AB × ab: 41% AB 39% ab 9% Ab 11% aB AC × ac: 45% AC 48% ac 4% Ac 4% aC BC × bc: 44% BC 44% bc 6% Bc 6% bC AD × ad: 48% AD 46% ad 3% Ad 3% aD BD × bd: 37% BD 37% bd 12% bD 13% Bd Which is the best map for these four genes? A. B 6mu A 4mu C 3mu D B. B 12mu C 8mu A 6mu D C. D 3mu A 4mu C 6mu B D. A 4mu C 6mu B 12mu D E. The data suggest that the genes are not linked.
A drug that disrupts a microbial function not found in animal cells usually has a higher therapeutic index.
Answer the following statement true (T) or false (F)
Auxin concentration gradients
a. appear once germination begins. b. cause regional differences in gene transcription. c. allow formation of plant parts in expected patterns. d. help young cells elongate so that shoots and roots lengthen. e. are described by all EXCEPT “appear once germination begins.”