Which components of an atom do not have a charge?
I. electrons
II. protons
III. neutrons
a. I only
b. II only
c. III only
d. I and II
e. II and III
Answer: c
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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.
Hydrogen bonding is strongest between
a. adenine and guanine. b. uracil and thymine. c. guanine and uracil. d. adenine and thymine. e. cytocine and guanine
A nursing baby:a
lacks cell mediated immunity. b. lacks antibody mediated immunity. c. lacks an adaptive immune response. d. receives active immunity via the breast milk. e. receives passive immunity via the breast milk.
Which of the following is a bacterial infection that can cause the uterine tubes to be blocked by scar tissue?
A) Chlamydia B) Genital herpes C) HIV D) Trichomoniasis E) HPV