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