For photosynthesis in green plants, the electron donor for the light-dependent reaction is
A. carbon dioxide.
B. oxygen.
C. water.
D. RuBP.
E. chlorophyll II.
Answer: C
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What would be the most direct result of an individual having an inability to produce surfactant in their alveoli?
A. The alveoli would physically collapse. B. The alveoli would be much more likely to harbor infections. C. The alveoli would fill with fluid due to an ion transport defect. D. Oxygen exchange with the blood would be impaired due to a thickening of the epithelium. E. Carbon dioxide exchange with the blood would be impaired due to an inhibition of carbonic anhydrase.
During a vasectomy, which structure is cut?
a. epididymis b. prostate c. seminiferous tubules d. seminal vesicles e. vas deferens
HIV
is a retrovirus. infects most mammals. can be killed with antibiotics. causes liver cancer. can be transmitted through the skin
Match the terms with the labeled structures on the diagram. 
myelin sheath
Fill in the blank(s) with the appropriate word(s).