High temperatures increase reaction rates but lower rubisco selectivity for CO2 versus O2. High leaf temperatures thus __________
A. increase photorespiration rates
B. decrease photorespiration rates
C. increase respiration
D. decrease RuBP carboxylation
E. increase RuBP carboxylation
A
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Which of these structures is a covering for the gill chamber in ray-finned fishes?
a. swim bladder b. spiral valve c. operculum d. atrium e. lateral-line system
Where does the lens FOCUS an image in the mammalian eye?
a. on the retina, using the entire surface of the retina b. primarily on the fovea c. on the rods only d. slightly in front of the retina, so the neural cells don't distort the image e. it depends on where you are looking; sometimes on the fovea, sometimes elsewhere on the retina
The event in the cell division process that clearly involves microfilaments is
a. chromosome separation during anaphase. b. movement of chromosomes to the metaphase plate. c. chromosome condensation during prophase. d. disappearance of the nuclear envelope during prophase. e. cytokinesis in animal cells.
All of the following are associated with subacute endocarditis, except:
A. it occurs in patients that have prior heart damage. B. it is caused by immune system autoantibodies that attack heart and valve tissue. C. oral bacteria get introduced by dental procedures to the blood. D. bacteria colonize previously damaged heart tissue resulting in vegetation. E. signs and symptoms include fever, heart murmur, and possible emboli.