If you saw this strand of DNA how many base pairs would be in the
strand?
aagcttctgaatcag
ttcgaagacttagtc

There are 15 base pairs in the strand.

Explanation:

A DNA is a double stranded helical molecule containing four different nitrogenous bases. The nitrogenous bases found in DNA are Adenine, Thymine, Cytosine and Guanine.

In the double stranded sequence above, a base in the first strand pairs with a base directly under it in the second strand. Thus, A pairs with T while G pairs with C. Each of the strands have 15 bases which represents 15 base pairs.

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