Preparation for the fight-or-flight response includes activation of the _____ nervous system
A) sympathetic
B) somatic
C) central
D) visceral
E) parasympathetic
Answer: A
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Which of the following statements are not true of the relationship of xylem and phloem?
A. Water exiting the phloem may enter the xylem and be transported to leaves. B. The volume of water moving through the phloem is small compared to that in the xylem. C. The number and size of xylem conduits greatly exceeds the number and volume of sieve tubes. D. In phloem, the plant actively generates the force that drives transport, whereas movement in xylem is largely driven by transpiration. E. Phloem cells are dead at maturity, whereas xylem cells are alive at maturity.
The genetic code is translated in groups of ________ bases.
A. four B. three C. two D. five
As more CO2 is released into the atmosphere, which of the following would you predict may happen to S. yellowstonensis diatoms in Yellowstone Lake?
a. Their shells would get thicker b. There would be no effect because CO2 does not dissolve into water c. Photosynthesis would decrease d. They would grow more spines e. They would revert back to S. niagarae
A highly resistant bacterial structure having a low metabolic rate is a(n)
A. pathogen. B. mutation. C. endospore. D. toxin.