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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
Publisher: Cengage Learning
ISBN: 9781305389892
BuyFind

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
Publisher: Cengage Learning
ISBN: 9781305389892

Solutions

Chapter
Section
Chapter 3, Problem 10TYK
Textbook Problem
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RNA differs from DNA because:

a. RNA may contain the pyrimidine uracil, and DNA does not.

b. RNA is always single-stranded when functioning, and DNA isalways double-stranded.

c. the pentose sugar in RNA has one less O atom than thepentose sugar in DNA.

d. RNA is more stable and is broken down by enzymes lesseasily than DNA.

e. RNA is a much larger molecule than DNA.

Expert Solution
Summary Introduction

Introduction:

Nucleic acids are biomolecules, which formed by polymerization of nucleotides. Nucleotides are composed of a pentose sugar, nitrogenous base, and phosphate group. Nucleic acids are of two types and are classified on the basis of pentose sugar present in their structure. These are RNA (ribonucleic acid), which contains ribose sugar and DNA (deoxyribonucleic acid), which contains deoxyribose sugar.

Explanation of Solution

Justification for the correct answer:

Option (a) is given that RNA differs from DNA because RNA contain uracil but DNA does not. It is because uracil is exclusive to RNA. This pyrimidine forms a double hydrogen bond with adenine. In DNA, thymine is present instead of uracil. So, it is an incorrect option.

Justification for the incorrect answers:

Option (b) is given that RNA differs from DNA because RNA is always in single-stranded form while functioning, and DNA is always double-stranded. In maximum cases, except for certain viruses, the organisms contain double-stranded DNA and single-stranded RNA when functioning. So, it is an incorrect option.

Option (c) is given that RNA differs from DNA because pentose sugar in RNA has one less oxygen than that in DNA...

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