Why did animal life probably diversify during the "Cambrian explosion"?
a. predator-prey relationships stimulated animal diversity
b. changing sea levels increased available land for animal habitat
c. increases in atmospheric oxygen allowed larger body sizes
d. the permian extinction left many vacant niches
e. A and C
Answer: e. A and C
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Negatively charged subatomic particles that have almost no mass are called:
A. electrons. B. protons. C. neutrons. D. ions. E. polymers.
What is a transgenic organism?
a. an organism with multiple copies of the same gene b. an organism that has genes from another species c. an organism that does not use DNA to specify proteins d. an organism that has had its entire genome sequenced e. an organism that has been DNA profiled
Nutrient absorption is mediated by the
A. peptidoglycan layer. B. nuclear membrane. C. cell wall. D. cell membrane. E. proteins in the periplasmic space.
In an atom, the number of protons always equals the number of
A. neutrons and protons. B. neutrons. C. neutrinos. D. electrons. E. quarks.