Which of the following statements is not true concerning the estrogen spike at the end of the follicular phase?
A. It has a positive feedback effect on the pituitary gland.
B. It is followed by ovulation.
C. It causes a decline in gonadotropin-releasing hormone from the hypothalamus.
D. It is followed by a surge of LH.
E. It has a positive feedback effect on the hypothalamus.
Answer: C
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The basic cells used for rapid communication and control are
A. neuroglia B. neurons C. chondrocytes D. blood cells
Convergent evolution occurs when two species living in
A. different areas evolve similarities through natural selection acting on those characteristics. B. the same area become reproductively isolated. C. different areas become reestablished and are able to reproduce. D. the same area are competing for the same resource thus causing one to evolve away from the other.
In the figure above, the distribution of offspring traits (the bottom panel) is shifted away from the distribution of the parental generation (top panel) because:
a. natural selection has altered the allele frequencies in the population. b. epistasis has created novel phenotypes. c. mutation has generated new alleles. d. dominant alleles have created new trait values. e. None of the above.
How many more people could be fed on one pound of grain than one pound of meat?
A. 5 times B. 10 times C. 3 times D. 20 times E. 2 times