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Which is not a
| a. adenine | c. glutamine | e. cytosine |
| b. guanine | d. thymine | f. All are in DNA. |
Introduction:
DNA is a polymer of nucleotides. Each nucleotide consists of a deoxyribose sugar, three phosphate groups, and a nitrogen-containing base.
Answer to Problem 1SA
Correct answer:
Glutamine is not a nucleotide base in DNA. Hence, the correct answer is option c.
Explanation of Solution
Reason for correct answer:
Option c. is given as “glutamine.”
The four nitrogen bases of DNA are adenine, thymine, cytosine, and guanine. Glutamine is one of the
Reason for incorrect answer:
Option a. is given as, “adenine.”
Adenine is one of the two purine bases that form the nucleotides of DNA. Glutamine is classified under the category of amino acids. Hence, option a. is incorrect.
Option b. is given as, “guanine.”
Guanine is a nitrogenous base that belongs to the purine group. Glutamine is absent in the double-stranded DNA structure. Hence, option b. is incorrect.
Option d. is given as, “thymine.”
Thymine belongs to the pyrimidine group of nitrogen bases of DNA. Glutamine does not belong to the category of pyrimidines. Hence, option d. is incorrect.
Option e. is given as, “cytosine.”
Cytosine is a pyrimidine base in the nucleotides of DNA. Glutamine does not belong to the category of either purines or pyrimidines. Hence, option e. is incorrect.
Option f. is given as, “All are in DNA.”
Adenine, thymine, cytosine, and guanine are the four nitrogenous bases present in the double-helical structure of DNA. However, glutamine does not belong to the category of nitrogenous bases present in the DNA molecule. Hence, option f. is incorrect.
Hence, the options a., b., d., e., and f. are incorrect.
The four nitrogen bases of DNA are adenine, thymine, cytosine, and guanine. Glutamine is an amino acid and is absent in DNA bases. Thus, the correct answer is option c.
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Chapter 8 Solutions
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