Which is NOT true about gene mutations?
a. All are transmitted to the next generation.
b. They are rare but their rates can be predicted.
c. Those with beneficial effects will be favored by
natural selection.
d. Many reduce an individual’s chance of surviving
and reproducing.
e. Those with neutral effects neither help nor hurt
the individual.
Answer: a
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Four of the five answers listed below are functions of epithelium. Select the exception
a. absorption b. contracting c. covering d. lining e. secreting
An Rh-negative mother will need a special treatment if she gives birth to an Rh-positive baby. The treatment involves the destruction of any stray blood cells from the baby that pass into the mother's bloodstream. Why is this necessary?
A) The mother's immune system will attack the Rh-positive cells and produce antibodies that will attack a fetus in a subsequent pregnancy. B) The mother's immune system will attack her own blood cells and the cells in the fetus of a subsequent pregnancy. C) Without this treatment, the mother's immune system will attack only her own blood cells. D) Without this treatment, antibodies will be formed in breast milk, which could harm the baby.
The Island of Krakatau has provided an ideal setting for studies of which kind of succession?
A) primary B) secondary C) tertiary D) quaternary
Which of the following are NOT phototrophic bacteria?
a. heliobacteria b. purple sulfur bacteria c. sulfur-oxidizing bacteria d. cyanobacteria