Which of the following statements correctly characterizes the relationship between NADP+/NADPH and NAD+/NADH?
A) Both are used extensively during photosynthesis in oxygenic phototrophs.
B) Neither are helpful to oxygenic phototrophs.
C) NADP+/NADPH has an extra phosphate compared to NAD+/NADH.
D) NADP+/NADPH is used primarily for catabolic reactions.
E) Only NAD+/NADH is used to transport electrons and protons.
C) NADP+/NADPH has an extra phosphate compared to NAD+/NADH.
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Human activities have disrupted the carbon cycle by
A) burning carbon stored as fossil fuels or biomass, thus increasing the amount of carbon dioxide in the atmosphere. B) decreasing the primary productivity of the oceans, resulting in increased atmospheric carbon dioxide. C) burning methane hydrates to produce electricity. D) acidifying the ocean, resulting in the release of large amounts of dissolved carbon dioxide into the atmosphere.
Special cells found in the gonads that give rise to gametes upon division are called
a. germ cells. b. somatic cells. c. stem cells. d. basal cells. e. egg cells.
Flexibility is the ability to move joints freely through their full range of motion.
a. true b. false
Superantigens
a. activate more T cells than normal. b. activate more B cells than normal. c. bind to MHC molecules outside of the normal antigen binding site. d. do all of the above. e. are characterized by a and c.