Which two endocrine glands exert the most control over blood calcium levels?
A) thyroid and ovaries
B) adrenal cortex and thyroid
C) anterior pituitary and adrenal cortex
D) thyroid and parathyroid
E) parathyroid and anterior pituitary
D
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Which of the following terms DOES NOT describe a basic type of protistan nutrition?
A. phagotrophic B. eutrophic C. osmotrophic D. autotrophic E. mixotrophic
A research lab is trying to produce new antibiotics. They come up with drugs that detach the hydrophilic heads from the phospholipids in plasma membranes. This drug
A. would be highly toxic and completely useless for human beings-we also have plasma membranes with hydrophilic head groups! B. would be highly toxic only to bacteria, making it an excellent drug to develop and test further. Humans have a different phospholipid structure in their cell plasma membranes than bacteria. C. would generally not be toxic enough to damage Gram-negative bacteria, as their plasma membranes lie under a thick layer of peptidoglycan. D. would be highly toxic for human beings, but might be useful as a topical antibiotic skin cream. The top layer of skin cells is dead anyway, so it wouldn't matter if this damaged those cells. It could NOT be taken internally, though, by human beings.
In a human fetus that has the XX combination of sex chromosomes, the gonads develop into ovaries
a. True b. False
A person with antigen A on their red blood cells can give blood to someone with blood type(s)
a. A and AB b. B and AB c. only AB d. only O