Which of the following is a common selective agent for natural selection?
A. mutations
B. competition for food and other resources
C. sex ratio
D. population size
B. competition for food and other resources
Biology & Microbiology
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Which of the following is present when sperm penetration occurs?
Biology & Microbiology
True or False: Vertebrates may have an external skeletal system
A. true B. false
Biology & Microbiology
Which of the following is not a "natural" means of transferring DNA in prokaryotes?
A) conjugation B) electroporation C) transduction D) transformation E) infection
Biology & Microbiology
Epigenetics is most closely associated with
which of the following?
a. base-pair substitution b. metylation c. Barr bodies d. hydrolysis e. phosphorylation
Biology & Microbiology