EBK LIFE: THE SCIENCE OF BIOLOGY
EBK LIFE: THE SCIENCE OF BIOLOGY
11th Edition
ISBN: 8220103935432
Author: Sadava
Publisher: MAC HIGHER
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Chapter 4, Problem 5Q
Summary Introduction

To review:

The organisms from Table 1, which has similar GC (cytosine and guanine) and AT (adenine and thymine) contents and the mechanism by which their genetic makeup is similar yet they are different from each other.

Given:

The data of the total content of AT and GC in the tissues of some organisms is compiled in the form of Table 1, below:

Table 1: Total AT and GC content of DNA in some organisms.

Organism and the tissue from which DNA is extracted A+T C+G
Herring sperm 55.3 44.8
Rat bone marrow 57 42.9
Human sperm 61.9 38.1
Escherichia coli 49.9 50.1
Yeast 64.2 35.8

Introduction:

In deoxyribose nucleic acid (DNA), a purine always base pairs with a pyrimidine, suggesting that DNA exists as a double-helix structure. Adenine (purine) always makes base pairs with thymine (pyrimidine) by two hydrogen bonds, and cytosine (pyrimidine) always makes base pairs with guanine (purine) by three hydrogen bonds. The genetic makeup of an organism is defined by the amount of AT and GC content present in its DNA.

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