What percentage of what we perceive as taste is due to smell?
A. 80-90%
B. 40-50%
C. 10-20%
D. 100%
E. 0%
Answer: A
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Which of the following is the most likely explanation for the lack of a filter blocking the passage of alcohol between the maternal and fetal circulations in humans?
A) There has not been enough time to evolve such a barrier. B) Such a barrier would probably also block important molecules that need to be passed to the fetus. C) The maternal and fetal blood mix directly together in an area with many villi, so a barrier is impossible. D) Alcohol has some positive effects on the fetus, so evolution has resulted in an intermediate level of filtering that blocks all but the worst abuses of alcohol.
Gram-negative diplococci are isolated from a genital specimen and yield the following results: • Glucose: positive • Maltose: negative • Lactose: negative The organism can be identified as:
a. N. gonorrhoeae. b. Neisseria meningitidis. c. Neisseria lactamica. d. M. catarrhalis.
A naturalist is studying morphological patterns that are shared between species in two temperate rainforests that are located on different continents. This would be an example of which field of study?
a. biomorphology b. comparative ecology c. biological geology d. comparative geography e. biogeography
The immune system's attack on the body's own
cells a. is an autoimmune response. b. results in anaphylactic shock. c. is a type of acquired immune deficiency syndrome. d. is due to the inactivation of helper T cells. e. is due to an error in the production of MHC markers.