The oxygen released in photosynthesis comes from ____.
A. carbon dioxide
B. glucose
C. ribulose bisphosphate
D. water
E. atmospheric oxygen
Ans: D. water
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Which one of the following is not an ecosystem service?
A. maintaining the quality of water supplies B. habitat restoration C. preventing soil erosion D. absorbing pollutants E. moderating climate
Which of the following is mismatched regarding helicase activity?
A. ATP coupling stoichiometry: ATP consumed per base pair traversed B. step size: average number of base pairs covered per ATP C. processivity: numbers of base pairs replaced D. directionality: defined direction of movement E. oligomeric state: helicase functioning in multiples
The structure labeled "4" in the figure is a(n) ____
a. asexual spore b. haploid spore
c. zygospore d. gamete e. spore sac
The Earth's carrying capacity is:
a. 1 billion. b. 1 million. c. 4 billion. d. 16 billion. e. unknown.