The sperm head encloses a compact nucleus and is capped by a vesicle called what?
A. vas deferens
B. acrosome
C. epididymis
D. Sertoli cell
E. flagellum
Answer: B
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Which part of the neuron is responsible for receiving information?
A. axon B. dendrite C. soma D. nucleus E. axon hillock
When pH levels in the blood get too low,
chemical buffers are released that return blood pH back to normal levels. This is an example of ___.
a. negative feedback b. positive feedback c. constancy d. sensory perception e. endothermal reactions
Movement of individuals into or out of the population, called gene flow, impacts evolution of populations because
A) it can lead to extinction of one or more populations. B) it may cause genetic drift. C) it leads to a redistribution of alleles. D) adaptive radiation results. E) a founder effect will occur.
How much rainfall is received in a desert?
A) a negligible amount (essentially 0 inches per year) B) less than 1 inch per year C) less than 20 inches per year D) more than 20 inches per year