A molecular clock for evolution is based on
A. fossil records of organisms.
B. cellular structures of organisms.
C. nucleotide sequences in the genomes of organisms.
D. enzymatic activities of organisms.
Ans: C. nucleotide sequences in the genomes of organisms.
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Which of the following is most likely to produce an African butterfly species in the wild whose populations show two strikingly different color patterns?
A) artificial selection B) directional selection C) stabilizing selection D) disruptive selection E) sexual selection
Acridine orange is a purine base analogue.
Answer the following statement true (T) or false (F)
The term ________ refers to the degree or intensity of pathogenicity.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements about euglenoids is false?
a. They are much more common in fresh water than marine environments. b. Most are photosynthetic. c. Their cell body is surrounded by a pellicle. d. Some absorb nutrients from their environment in a heterotrophic manner. e. They move by pseudopodia.