Question

question 3 of 25
what role do restriction enzymes play in the analysis of edna?
a. they purify samples of dna obtained from the environment.
b. they sort different sized dna fragments into a banding pattern.
c. they multiply small amounts of dna into larger samples.
d. they break dna into fragments that vary in size.

Explanation:

Restriction enzymes are endonucleases that recognize specific DNA sequences and cleave the DNA at those sites, producing fragments of varying lengths. Option A describes DNA purification methods, not restriction enzyme function. Option B refers to gel electrophoresis, which separates DNA fragments by size. Option C is the role of PCR (polymerase chain reaction), which amplifies DNA quantities.

Answer:

D. They break DNA into fragments that vary in size.