McGraw-Hill Online Learning Center Test

McGraw-Hill Online Learning Center Test


1. Review the image and answer the following questions.

What are introns?

A. Introns are coding regions of DNA molecules.
B. Introns are enzymes used to splice DNA.
C. Introns are noncoding regions of DNA molecules.
D. Introns are repeating segments of DNA that occur at the tips of most chromosomes.


2. What is true about the relationship between introns and exons?

A. Introns often comprise more of the DNA molecule than do exons.
B. Introns are only found in eukaryotic cells; prokaryotes have only exons.
C. There appears to be an evolutionary role for intron-exon organization.
D. All of these are correct.
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