A zygote is formed ____
a. after a fertilized egg undergoes mitotic divisions to mature
b. by the fusion of male and female somatic cells
c. by the fusion of egg and sperm nuclei
d. directly by meiosis in fungi
e. by the mitotic divisions of spores in plants
ANSWER: c
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In competition between P. caudatum and P. bursaria, neither species goes extinct. This is because they don't utilize the same resources. This conclusion is generalized as the
A. extinction theory. B. the frequency of competition hypothesis. C. competition hypothesis. D. coexistence theory. E. competitive exclusion theory.
In CAM plants, such as cacti, stomata are
a. open during the night and closed during the day. b. nearly always open. c. closed only when guard cells are not exposed to sunlight. d. almost never open. e. open during the day and closed during the night.
Why is phosphorus so important to living organisms?
What will be an ideal response?
Universal precautions is designed to protect
A. the general public. B. patients. C. health care providers. D. All of these choices are correct.