Which of the following is considered a mechanical vector transmission?
A. cockroach transmission of Shigella
B. mosquito transmission of Plasmodium
C. flea transmission of Yersinia
D. tsetse fly transmission of Trypanosoma
E. louse transmission of Rickettsia
Answer: A
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Severe neural tube defects in the embryo can
be mostly avoided if the mother takes vitamin
a. D. b. Bs. c. C. d. E. e. K.
In the fetus and during early puberty, in addition to corticosteroids, the adrenal cortex produces
a. insulin. b. androgens. c. ACTH d. epinephrine. e. norepinephrine.
The pH of human blood falls within a ________ range that is near a pH of 7.4
Fill in the blank(s) with correct word
Which of the following types of cell cleavage is found most often for protostomes?
a. spiral, indeterminate cleavage b. radial, indeterminate cleavage c. radial, determinate cleavage d. spiral, determinate cleavage