In lakes and ponds, photosynthesis occurs primarily in the
A) benthic zone.
B) profundal zone.
C) limnetic zone.
D) lotic zone.
C
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Gastrulation is an important event in early embryonic development. Which of the following is NOT a result of gastrulation?
A) formation of three embryonic cell layers B) movement and alignment of many embryonic cells C) the formation of a gastrula D) the formation of specialized adult tissues
Proteins and RNA molecules that are needed in the cell, at about the same level under all growth conditions, require constitutive expression
Indicate whether the statement is true or false.
A nerve net is the type of nervous system that would be found in which of the following organisms?
A. jellyfish B. cockroach C. fiddler crab D. earthworm E. frog
Which of the following statements about Neisseria gonorrhoeae is FALSE?
A. It causes disease in humans only. B. The gonococci stick to epithelial cells via fimbriae and capsules. C. The gonococci secrete a protease that destroys secretory IgA. D. The gonococci induce lasting immunity. E. Infected women are often asymptomatic.