In a plant, the reactions that produce molecular oxygen (O2 ) take place in _____
A) the light reactions alone
B) the Calvin cycle alone
C) the light reactions and the Calvin cycle
D) neither the light reactions nor the Calvin cycle
A
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Which type of reproductive isolation operates to keep the mosquitofish isolated, even when fish from different ponds are reunited in the same body of water?
A) behavioral isolation B) habitat isolation C) temporal isolation D) mechanical isolation E) gametic isolation
All of the following are a form of potential energy that can be used by a cell EXCEPT
A. concentration gradient. B. ATP. C. NADH. D. nitrogen. E. an electrical/ion gradient.
The interplay of multiple excitatory and inhibitory inputs most affects what part of a neuron?
A) The axon B) Dendrites C) The neuron's cytoskeleton D) Axon hillock E) The nucleus
Arrange the following in the proper order in which they occur during clonal selection.
1. Helper T cells are activated. 2. Macrophages ingest antigen. 3. B cells differentiate into plasma cells and memory cells. A. 1, 2, 3 B. 2, 1, 3 C. 2, 3, 1 D. 3, 2, 1 E. 3, 1, 2