Which of the following is not a cell or structure found in sponges?
A. mesohyl
B. choanocyte
C. gastric cavity
D. pore
C
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You are studying with a classmate who asks you about the concept of a replacement rate. She wants to know what happens to a population if the replacement rate is reached? She also assumes the average human replacement rate is 2.0. What would you tell her?
A. When replacement rate is reached, the population declines. The replacement rate is greater than 2.0 to make up for declining birth rates. B. When replacement rate is reached, the population increases. The replacement rate is lower than 2.0 to make up for increasing birth rates. C. When replacement rate is reached, the population is in equilibrium. The replacement rate is equal to 2.0 to replace both mother and father. D. When replacement rate is reached, the population is in equilibrium. The replacement rate is greater than 2.0 because some individuals die before they reproduce. E. When replacement rate is reached, the population declines. The replacement rate is lower than 2.0 to make up for increasing birth rates.
Which molecule is a "metabolic taxicab" that shuttles electrons?
A) OAA B) NADH C) ATP D) ADP
The photoreceptor that absorbs blue light and triggers a phototropic response is:
a. phototropin. b. phytochrome. c. jasmonate. d. systemin. e. zeatin
Which of the following is not an accessory pigment used to absorb photons that cannot be captured by chlorophyll?
A) beta-carotene B) a phycobilin C) lutein D) phycochlorophyll E) phycocyanin