Complement helps in the defense against bacterial invasion by:
A. promoting phagocytosis.
B. neutralizing bacterial toxins.
C. preventing bacteria from penetrating the skin.
D. fusing lysosomal granules to bacterial cell walls.
Answer: A. promoting phagocytosis.
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The process where two gametes fuse with each other in the process of fertilization to begin the life of a new organism is called
A. sexual reproduction. B. gametogenesis. C. asexual reproduction. D. X-linked inheritance. E. multicellularity.
Plants that are called C4 plants are better able to utilize ________ than C3 plants.
A. oxygen B. minerals C. water D. carbon dioxide E. chlorophyll
The edible portion of the mushroom is the ________
A) mycelium B) hypha C) spore D) above-ground reproductive structure
Why do areas of upwelling tend to have large and diverse populations of organisms?
A) Upwelling moves dinoflagellates to the aphotic zone. B) Upwelling brings nutrient-rich water up from the ocean depths. C) Upwelling brings aphotic organisms to the ocean surface. D) Upwelling lowers the level of oxygen in the water. E) Upwelling mixes deep-ocean fresh water with salt water from rivers.