What type of speciation requires a geographic barrier?
A. sympatric speciation
B. allopatric speciation
C. Both sympatric and allopatric speciation require a geographic barrier.
D. Neither sympatric or allopatric speciation require a geographic barrier.
Answer: B
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The principal difference between simple and stratified epithelium is in the number of
a. cell layers. b. total cells. c. nuclei per cell. d. free surfaces. e. microvilli.
What has the overuse of antibiotics led to?
A) Bacterial strains that are more susceptible to antibiotics. B) Resistant strains of bacteria that are immune to antibiotics.
Ribosomes are a type of (apoenzyme/enzyme/ribozyme).
Fill in the blank(s) with the appropriate word(s).