Which of the Following Sequences is Considered an STR

Question

Which of the following sequences is considered an STR?
A)CGTATTATGC
B)TACGTACGTACG
C)CAGCAGCAG
D)TATTACGCCG
E)A and B only

Accepted Answer

An STR or Short Tandem Repeat is a repeating sequence of DNA consisting of two to five nucleotides. The sequence "CAGCAGCAG" in option C is a STR. Options A and D do not have any repeats, while option B has repeats of four nucleotides, making it a Long Tandem Repeat (LTR) and not an STR.