In a particular population, over the course of several dozen generations, an adenine was replaced by a guanine at a particular non-coding locus in the DNA base sequence. The evolutionary mechanism responsible for this change was:

a) migration.
b) mutation.
c) bottlenecks.
d) directional selection.
e) genetic drift.


Answer: b) mutation.

Biology & Microbiology

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Key mechanisms of horizontal gene transfer include all of the following except

A) transformation. B) transposons. C) reproduction. D) conjugation. E) transduction.

Biology & Microbiology

________ produces short sequences of RNA, which allows polymerase to synthesize a new strand of DNA.

A. DNA polymerase B. DNA helicase C. DNA topoisomerase D. DNA primase E. DNA ligase

Biology & Microbiology

In the living cell, histone proteins pack DNA into a repeating array of DNA-protein particles called what?

a. beads on a string b. euchromatin c. octamers d. nucleosomes e. heterochromatin

Biology & Microbiology

The sequencing method that cuts DNA segments into fragments, arranges those fragments based on overlapping nucleotide sequences, and then clones these fragments is called

A. consensus sequencing. B. clone-by-clone sequencing. C. shotgun sequencing. D. RFLP sequencing.

Biology & Microbiology