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

To analyze:

The total GC (guanine and cytosine) and AT (adenine and thymine) content of deoxyribose nucleic acid (DNA) from the given data set and comparison of different organisms, on the basis of the combined AT and GC contents.

Given:

The percent (%) of DNA bases from some organisms have been compiled in the form of Table 1 below:

Table 1: Percent of DNA bases in some organisms.


Organism and the tissue from which DNA is extracted
Composition of DNA base (%)
Adenine Guanine Cytosine Thymine
Herring sperm 27.8 22.2 22.6 27.5
Rat bone marrow 28.6 21.4 21.5 28.4
Human sperm 30.7 19.3 18.8 31.2
Escherichia coli 26.0 24.9 25.2 23.9
Yeast 31.3 18.7 17.1 32.9

Introduction:

In every organism, the genetic material is passed from one generation to another generation in the form of a code, which is present in DNA. The DNA is a double-helix structure, which contains purines and pyrimidines. The purines present in DNA are adenine and guanine and the pyrimidines are cytosine and 5-methyl uracil (thymine).

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