The differential success of alleles is called _____

A. selection.
B. genetic drift.
C. fixation.
D. migration.
E. evolution.


A

Biology & Microbiology

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A small RNA unit without a protein coat is called a ________

a. prion b. vector c. pathogen d. viroid e. virus

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Secondary cell walls are stronger than primary cell walls because secondary cell walls contain

a. more pectin. b. less lignin. c. more chitin d. more lignin e. layers of cellulose fibrils at various orientations to one another.

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A geographic barrier is needed for ______ speciation.

a) allopatric b) sympatric

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The amniotic egg first appeared in which group of animals?

A) reptiles B) amphibians C) mammals D) birds

Biology & Microbiology