Exemplar Problems

Question:

If the sequence of one strand of DNA is written as follows:

5’ -ATGCATGCATGCATGCATGCATGCATGC-3'

Answer:

To find the sequence of the complementary strand in the 5’→3’ direction, we pair the bases:

A (Adenine) pairs with T (Thymine)

T (Thymine) pairs with A (Adenine)

G (Guanine) pairs with C (Cytosine)

C (Cytosine) pairs with G (Guanine)

The complementary strand is:

3’ -TACGTACGTACGTACGTACGTACGTACG-5'

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