Eukaryotic DNA Comprises Three Major Classes: Unique-Sequence DNA, Moderately Repetitive

Multiple Choice

Eukaryotic DNA comprises three major classes: unique-sequence DNA, moderately repetitive DNA, and highly repetitive DNA. Unique-sequence DNA consists of sequences that exist in one or only a few copies; moderately repetitive DNA consists of sequences that may be several hundred base pairs in length and is present in thousands to hundreds of thousands of copies. Highly repetitive DNA consists of very short sequences repeated in tandem and is present in hundreds of thousands to millions of copies. The density of genes varies greatly among and even within chromosomes.
-Most of the genes that encode proteins are found in

A) unique-sequence DNA.
B) moderately repetitive DNA.
C) highly repetitive DNA.
D) all of the above