Lightning causes a fire that destroys all the plants in a forest community. Which of the following is most likely to be the first to occupy the burned area?
A. oak seedlings
B. pine trees
C. grasses and annual plants
D. woody shrubs
Answer: C. grasses and annual plants
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Centrioles and a starburst cluster of spindle fibers would be found in
(a) both plant and animal cells. (b) only plant cells. (c) only animal cells. (d) none of the above.
In mosses and fungi, the process of meiosis produces
A) egg cells. B) pollen nuclei. C) spores. D) sperm cells. E) prothalli.
Retroviruses ____
a. have DNA genomes b. use an RNA intermediate to replicate their genome c. replicate their RNA genome directly to produce progeny RNA genomes d. do not have an envelope e. require reverse transcriptase to replicate their genome
In Figure 39-3, the responses initiated at point A in response to an increase in body temperatureinclude:
a. a decrease in sweating and panting.
b. a decrease in muscle activity.
c. a constriction of blood vessels.
d. an increase in metabolism.
e. shivering.