What evidence suggests that the large amount of excess "junk" DNA in a genome may serve an important function?
A. All organisms have excess "junk" DNA.
B. A portion of "junk" DNA is highly conserved in its DNA sequence among many different eukaryotic species.
C. The nucleotide sequence of "junk" DNA is very similar to that of genes involved in important cell functions.
D. The sheer quantity of "junk" DNA suggests it must have some function in the life of the organism.
E. Deletions or mutations that fall within "junk" DNA tend to always be harmful to the organism.
Answer: B. A portion of "junk" DNA is highly conserved in its DNA sequence among many different eukaryotic species.
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