Which best describes STRs?
a. a piece of non-coding DNA that consists of 9–80 repeating sequences of base pairs
b. a piece of coding DNA that consists of 9–80 repeating sequences of base pairs
c. a piece of coding DNA consisting of 2–5 repeating sequences of base pairs
d. a piece of non-coding DNA consisting of 2–5 repeating sequences of base pairs

Option- B

The correct answer is: D. a piece of non-coding DNA consisting of 2–5 repeating sequences of base pairs.

Explanation:

STRs, abbreviated from Short Tandem Repeat, are microsatellites: sequences of non-coding DNA that repeat units that are 2 to 5 base pairs in length. The number of repetitions of these sequences varies from people to people, which gives it a significant importance in the fields of forensics, where is used to identify a person.

Non-coding DNA is a sequence that will not translate into any protein. Half of our DNA is made of non-coding DNA.

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