Place the following in developmental order beginning with the earliest event
1) limb buds appear
2) face begins to look human
3) muscles differentiate
4) downy hair covers the fetus
5) sex can be determined by external inspection
a. 3, 1, 2, 4, 5
b. 1, 3, 4, 2, 5
c. 1, 3, 2, 5, 4
d. 1, 2, 3, 4, 5
e. 1, 3, 5, 2, 4
e
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The same hormone stimulates gene expression in one cell, but inhibits gene expression in another cell. What is the best explanation for this difference?
A. The two cells have different types of receptors for the hormone. B. The two cells receive different amounts of the hormone. C. The two cells receive the hormone at different times. D. The hormone is degraded more quickly in one cell than the other. E. The hormone can diffuse through the plasma membrane of one cell, but not the other.
Biotic potential is controlled by all of the following
factors EXCEPT a. the age of individuals within the population. b. the resources available for each individual. c. fecundity rate. d. environmental disturbances. e. all of these control biotic potential.
The causative agent of cholera in humans is a member of the genus ________.
A. Vibrio B. Shigella C. Escherichia D. Enterobacter
Which cross will produce only heterozygous offspring?
A) AA aa B) AA Aa C) Aa Aa D) Aa aa