Which of the following is the most powerful?
Fast-twitch muscles
Mixed muscles
Slow-twitch muscles
Slow-twitch and fast-twitch muscles have the same strength.
A. Fast-twitch muscles
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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 organelle that carries out photosynthesis in plants is the
A. lysosome. B. chlorophyll. C. chloroplast. D. ribosome. E. mitochondria.
In the experiment above, guppy color patterns (spots) were measured in populations exposed to increasing amounts of predation. From this you could conclude that ________.
A. predators are less likely to catch and eat brightly colored guppies B. predators do not affect the color patterns of guppies C. predators are more likely to catch and eat brightly colored guppies D. evolutionary changes take millions of years to appear E. brightly colored guppies are more likely to reproduce in the presence of predators
In which of the following diseases can gender be considered a viable predisposing factor?
A) urinary tract infections B) pneumonia C) salmonellosis D) tetanus E) anthrax