Nitrogen is released into the atmosphere by
a. nitrogen fixation.
b. denitrification.
c. nitrification.
d. ammonification.
e. decomposition.
Answer: b
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Gel ________ is a process that separates DNA or protein fragments according to their size, by causing them to migrate within a gel in response to an electric field.
A. duplication B. blotting C. electrophoresis D. migration
Traits that are similar in two species as a result of common ancestry are referred to as:
A. homologous. B. analogous. C. convergent. D. derived. E. ancestral.
If the long, bright tail feathers of male birds of paradise are a sexually-selected trait, what could predict if we experimentally removed those feathers from a group of male birds of paradise?
A. The experimental male would attract fewer mates, and thus produce fewer offspring B. The experimental males would die at a younger age, and thus produce fewer offspring C. The experimental males would be basically unaffected D. Both A and B would occur
What do genetic map units represent?
a. relative positions of genes with respect to each other b. the chromosome on which a given gene is located c. the actual DNA sequence of a gene d. absolute physical distances between genes