Chapter 21, Problem 8STP

Interpretation Introduction

Interpretation:

The complementary pair of bases needs to be determined.

Concept introduction:

The nitrogenous bases of two strands are linked with hydrogen bond and the covalent type of bonding occurs within the chain of each strand of the double helix.

RNA- ribonucleic acid, RNA is a polymer of nucleotides that is consists of a ribose sugar, a phosphate, and nitrogenous bases.

DNA- deoxyribonucleic acid, it is a genetic material for a cell. It is consists of a deoxyribose sugar, a phosphate, and nitrogenous bases.

Answer to Problem 8STP

The complementary pairs of bases are given as-

Thymine pair with adenine and guanine pair with cytosine.

  $\text{T=A}$ , $\text{C}\equiv \text{G}$

Explanation of Solution

The nitrogenous bases in DNA are of four types. These are adenine (A), guanine (G), thymine (T), and cytosine (C).

The nitrogenous bases in RNA are adenine (A), guanine (G), uracil (U), and cytosine (C).

There is a difference based on only one nitrogenous base that is uracil present only in RNA, while the thymine is present in the DNA.

Conclusion

The nitrogenous bases in DNA are

Adenine (A), Guanine (G), Thymine (T), Cytosine (C)

The nitrogenous bases in RNA are

Adenine (A),Guanine (G) ,Uracil (U) ,Cytosine (C)

The base pairing occurs between two nitrogenous bases.