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.
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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
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.
Key mechanisms of horizontal gene transfer include all of the following except
A) transformation. B) transposons. C) reproduction. D) conjugation. E) transduction.
________ 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