Biology: Concepts and Investigations
Biology: Concepts and Investigations
5th Edition
ISBN: 9781260259049
Author: Hoefnagels
Publisher: MCG
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Chapter 7, Problem 1MCQ

A nucleotide is composed of all of the following EXCEPT a

a. sugar.

b. nitrogen-containing group.

c. sulfur-containing group.

d. phosphorus-containing group.

Expert Solution & Answer
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Summary Introduction

Introduction:

Nucleotides are defines as the organic molecules which serves as the building block of nucleic acid. It consists of phosphate group, pentose sugar and nitrogenous base. There are two types of nucleic acid such as ribonucleic acid and deoxyribonucleic acid. These are essential biomolecules responsible for forming all living forms on earth.

Answer to Problem 1MCQ

Correct answer:

The nucleotide is composed of phosphate group, pentose sugar and nitrogenous bases. Therefore, option (c) is correct.

Explanation of Solution

Reason for the correct statement

A nucleotide is organic molecule which is formed by phosphate group, pentose sugar and nitrogenous bases. There are two types of nitrogenous bases such as pyrimidine and purine bases. It also contain phosphate group. Deoxyribonucleic acid and Ribonucleic acid is formed by nucleotide. The only difference between in these two nucleic acid is presence of deoxyribose and ribose sugar as well as in RNA uracil is bonded with thymine while in DNA cytosine is bonded with thymine.

Option (c) is given as “sulfur-containing group”.

As, “Sulfur containing group is not found in nucleotide as it contains nitrogenous bases, phosphate group and sugar”, is the right answer.

Hence, option (c) is correct.

Reasons for the incorrect statements:

Option (a), is given as “sugar”.

There are two types of sugar is present in nucleotide as in RNA ribose sugar is present while in DNA deoxyribose sugar is present. Hence, it is a wrong answer.

Option (b), is given as “nitrogen-containing group”

Nitrogen-containing group are the nitrogenous bases which is of two types such as pyrimidine and purine. Hence, it is a wrong answer.

Option (d), is given as “phosphate-containing group”.

Nucleotide is formed by phosphate- sugar backbone along with that purine and pyrimidine bases are joined together by hydrogen bonds. Hence, it is a wrong answer.

Hence, options (a), (b), and (d), are incorrect.

Conclusion

Nucleotide is formed of sugar, phosphate group and nitrogenous bases and it do not contain sulfur containing group.

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Chapter 7 Solutions

Biology: Concepts and Investigations

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