Chapter 12, Problem 13Q

(a)

Interpretation Introduction

Interpretation: A $\text{DNA}$ code that complements the given sequence has to be written.

Concept Introduction:

The four major nitrogen-containing bases are:

Adenine:

It is represented with the letter “A”

Guanine:

It is represented with the letter “G”.

Thymine:

It is represented with the letter “T”.

Cytosine:

It is represented with the letter “C”.

Complementary bases:

• • Adenine is the complementary base of Thymine.
• • Cytosine is the complementary base of Guanine.
• • In DNA, Adenine always makes a double bond with thymine ($A=T$) and cytosine always makes triple bond with guanine $\left(G\equiv C\right)$

(b)

Interpretation Introduction

Interpretation: The connecting lines between the given and its complementary sequences that are representing the number of hydrogen bonds between each base pair have to be drawn.

Concept Introduction:

Hydrogen bonding between complementary bases:

The bases of nucleotides of one DNA strand makes hydrogen bonding with their respective complementary bases of the nucleotides of the other DNA strand. This hydrogen bonding keeps the two DNA strands of a DNA helix rigid and stable.