Which process does not aid expulsion of an infant by contractions during labor?
A) oxytocin produced by the mother
B) increased number of hormone receptors on uterine cells
C) oxytocin produced by the fetus
D) HCG produced by the mother
Answer: D
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Gorillas and chimpanzees DO NOT
a. both knuckle walk. b. both have long arms. c. are quadrapedal walkers. d. lack tails. e. have foramen magnum at the center base of the skull.
Almost all scientists support the idea that the global warming observed over the past 100 years has been caused by elevated levels of gases in the atmosphere. Which gas is primarily responsible for this problem?
A) carbon dioxide B) nitrous oxide C) oxygen D) ozone
When two species contain identical or nearly identical molecules such as proteins, this suggests
A) genetic modification has occurred to the populations. B) the two species share a common ancestry. C) the two species are in fact only one species displaying divergent evolution. D) the two species are in fact only one species displaying convergent evolution. E) the two species overlap in niches and likely share a common diet.
If the input water is labeled with a radioactive isotope of oxygen, 18O, then the oxygen gas released as the reaction proceeds is also labeled with 18O. Which of the following is the most likely explanation?
(A) During the light reactions of photosynthesis, water is split, the hydrogen atoms combine with the CO2, and oxygen gas is released. (B) During the light reactions of photosynthesis, water is split, removing electrons and protons, and oxygen gas is released. (C) During the Calvin cycle, water is split, regenerating NADPH from NADP+, and oxygen gas is released. (D) During the Calvin cycle, water is split, the hydrogen atoms are added to intermediates of sugar synthesis, and oxygen gas is released.