All of the Following Pertain to Nitrogenous Bases Except

question 75

Multiple Choice

All of the following pertain to nitrogenous bases except

• A)they form pairs by hydrogen bonding.
• B)guanine pairs with uracil.
• C)adenine pairs with thymine.
• D)cytosine and thymine are pyrimidines.
• E)they allow variation from one nucleotide to another which creates the encoded information.

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Definitions:

Fertilization

The union of male and female gametes to form a zygote, initiating the development of a new individual organism.

Temporal Isolation

A mechanism that prevents species from mating because they are active at different times of the day, year, or mating seasons.

Behavioral Isolation

A form of reproductive isolation in which two populations develop differences in mating rituals or behaviors that prevent them from breeding with each other.

Reproductive Isolating Mechanisms

The reproductive barriers that prevent a species from interbreeding with another species; as a result, each species’ gene pool is isolated from those of other species. See prezygotic barrier and postzygotic barrier.