Chapter 24, Problem 67A

Interpretation Introduction

Interpretation: From the given pairs A-A, A-T, C-G, G-A, A-U, and T-U, the base pair found in the DNA molecule has to be identified.

Concept introduction: Nucleotides are the chemical building blocks that make up deoxyribonucleic acid (DNA). DNA is a polymer made of two polynucleotide chains that form a double helix around each other.

Answer to Problem 67A

A-T and C-G are base pairs found in the DNA molecule.

Explanation of Solution

Adenine (A), cytosine (C), guanine (G), and thymine (T) are the four nitrogen-containing base pairs that make up a DNA molecule. The bases adenine and thymine and cytosine and guanine form complementary pairs. In ribonucleic acid (RNA), uracil (U) replaces thymine, which is not present in DNA. The structure of DNA is formed by the pairing and binding of these base pairs.

The given pairs are A-A, A-T, C-G, G-A, A-U, and T-U.

Only A-T and C-G are base pairs found in DNA from the given pairs.

Conclusion

A-T and C-G are base pairs found in the DNA molecule.