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Which is not a
a. adenine
b. guanine
c. glutamine
d. thymine
e. cytosine
f. All are in DNA.
Concept introduction: Nucleotides are building blocks of DNA and RNA. DNA has four nucleotides, namely adenine and guanine (which are purines), and thymine and cytosine (which are pyrimidines).
Answer to Problem 1SQ
Correct answer: Glutamine is not a nucleotide base in the DNA. Therefore, option c. is correct.
Explanation of Solution
Reasons for the correct statement:
Glutamine is a basic amino acid. DNA is made of purines and pyrimidines that are collectively called as nucleotides. Glutamine is neither a purine nor a pyrimidine.
Option c. is given as “glutamine”
As glutamine is an amino acid and not a nucleotide base, option c. is correct.
Reasons for the incorrect statements:
Option a. is given as “adenine”.
Adenine is a purine and a nucleotide base in DNA. Therefore, option a. is incorrect.
Option b. is given as “guanine”.
Guanine is a purine and is a nucleotide base in DNA. Therefore, option b. is incorrect.
Option d. is given as “thymine”.
Thymine is a pyrimidine and is a nucleotide base in DNA. Therefore, option d. is incorrect.
Option e. is given as “cytosine”.
Cytosine is a pyrimidine and is a nucleotide base in DNA. Therefore, option e. is incorrect.
Option f. is given as “All are in DNA”.
Adenine, guanine, cytosine, and thymine are present in DNA, and glutamine is absent in DNA. Therefore, option f. is incorrect.
Hence, options a., b., d., e., and f. are incorrect.
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Chapter 8 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
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