Adenine base pairs with thymine using bonds, and guanine base pairs with cytosine using bonds. A) two hydrogen, three hydrogen
B) three hydrogen, two hydrogen
C) three phosphoester, two phosphoester
D) two phosphoester, three phosphoester

Explanation:

The two strands are held together by hydrogen bonds between the bases, with adenine forming a base pair with thymine, and cytosine forming a base pair with guanine.

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answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion