Approximately how many species of bacteria have been isolated from the oral cavity?
a) 50
b) 100
c) 500
d) 700
Answer: d) 700
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The immotile sperm develop motility in about 18 hours after arriving at the long, coiled tube called the
A. vas deferens B. seminiferous tubules C. epididymis D. testis
During the sliding process in microtubules in cilia and flagella, the stalks of an axonemal dynein attach to, produce force on, and detach from a(n) ________ in a cyclic manner
A) A tubule B) B tubule C) radial spoke D) interdoublet nexin connections E) central pair
The rain shadow associated with mountains
A. is on the downwind side and has a wetter climate than the upwind side of the mountain. B. is on the upwind side and has a drier climate than the downwind side of the mountain. C. is on the downwind side and has a drier climate than the upwind side of the mountain. D. is on the upwind side and has a wetter climate than the downwind side of the mountain.
What does a plant gain from a mycorrhizal relationship?
A) It allows roots to absorb water and solutes more rapidly. B) It increases the surface area for photosynthesis. C) It helps to break down complex molecules in the soil to release micronutrients. D) It helps to break down decaying organic matter into essential plant nutrients.