10th Edition
Publisher: CENGAGE L
ISBN: 9781305967359


10th Edition
Publisher: CENGAGE L
ISBN: 9781305967359


Chapter 8, Problem 4SA
Textbook Problem

One species’ DNA differs from others in its _______.

a. nucleotides c. double helix
b. DNA sequence d. sugar-phosphate backbone

Expert Solution
Summary Introduction


DNA is a polymer of nucleotides. A chromosome contains DNA and associated proteins that carry a part or all of a cell’s genetic information.

Explanation of Solution

Reason for correct answer:

Option b. is given as “DNA sequence”.

DNA sequence is defined as the order of nucleotide bases in a DNA strand. Variation in sequence of DNA forms the basis of traits that distinguish individuals and define species. Therefore, DNA of one species differs from others in its DNA sequence.

Reason for incorrect answer:

Option a. is given as, “nucleotides”.

A nucleotide is the structural component of DNA. Nucleotide in DNA contains deoxyribose sugar, three phosphate groups, and a nitrogen-containing base. The four nitrogen bases of DNA are adenine, thymine, cytosine, and guanine. Nucleotides form the basic components of DNA in all species. However, DNA of different species varies due to the DNA sequence. Hence, option a. is incorrect.

Option c. is given as, “double helix”.

The two chains of nucleotides of a DNA molecule run in opposite directions and are coiled into a double helix...

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