Fossil footprints in Tanzania document the passage of a bipedal species ____ million years ago.
A. 2.4
B. 3.0
C. 3.6
D. 4.2
E. 4.8
Answer: C
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Fertilization typically occurs in the ____
a. ovary b. oviduct c. uterus d. cervix e. vagina
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.
A shortage of cholesterol in the body could interfere with the formation of:
A) all of the choices are correct B) estrogen C) cell membranes D) testosterone E) progesterone
A scientist observes that the height of a certain species of asters decreases as the altitude on a mountainside increases. She gathers seeds from samples at various altitudes, plants them in a uniform environment, and measures the height of the new plants. All of her experimental asters grow to approximately the same height. From this she concludes __________.
a. height is not a quantitative trait b. the trend in height that she observed was due to genetic variation c. the differences in the parent plants' heights were due to directional selection d. the height variation she initially observed was an example of environmental influence e. stabilizing selection was responsible for height differences in the parent plants