All of the following statements are true about mutations EXCEPT:
a) Most mutations are harmful or neutral to the organism in which they occur.
b) A mutation is any change in an organism's DNA.
c) The origin of genetic variation is mutation.
d) Mutations are almost always random with respect to the needs of the organism.
e) The mutation rate can be affected by the bottleneck effect.
Ans: e) The mutation rate can be affected by the bottleneck effect.
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Which characteristic applies to tropical rain forests?
a. Little sunlight reaches the forest floor. b. Diversity is limited because the tall forest canopy shuts out most of the incoming light. c. Conditions are extremely favorable for growing luxuriant food crops. d. Competition for resources is extremely low. e. Temperatures vary greatly.
An example of potential energy is/are
A) bonds that hold atoms together. B) energy for creating new molecules. C) dancing. D) running a marathon.
In the skin, blood vessels are found in the ________.
A. stratum corneum B. stratum basale C. dermis and subcutaneous layers D. dermis E. subcutaneous layer
The exit of an endospore causes the cell to
a. burst open b. return to dormancy c. lyse d. regenerate