Concept explainers
What are the four nitrogenous bases found in RNA?
a. cytosine, guanine, thymine, uracil (C, G, T, U)
b. adenine, cytosine, guanine, thymine (A, C, G, T)
c. adenine, cytosine, guanine, uracil (A, C, G, U)
d. alanine, cysteine, glycine, threonine (A, C, G, T)

Introduction:
The five nitrogenous bases consist of nitrogen-containing molecule used in the construction of nucleotide, a polymer that is the building block of the nucleic acids like DNA (deoxyribonucleic acid) and RNA (ribonucleic acid).
Answer to Problem 1TYK
Correct answer:
Adenine, cytosine, guanine, and uracil (A, C, G, U)
Explanation of Solution
Explanation/Justification for the correct answer:
Option (c) is given that A, C, G, and U are the nitrogenous bases found in the RNA. A group of five nitrogenous bases is utilized in building the nucleotides. The nitrogenous bases include adenine, guanine, cytosine, thymine, and uracil. The nitrogenous bases can be purines or pyrimidines. The adenine and guanine are six-membered nitrogen-containing rings; and they fall under the purines. While, thymine, uracil, and cytosine are six-membered nitrogen-containing rings; and they fall under pyrimidines. Uracil is found in the RNA and complements adenine instead of thymine. Hence, option (c) is correct.
Explanation for incorrect answers:
Option (a) is given that C, G, T, and U are the nitrogenous bases found in the RNA. In case of DNA, adenine forms double bonds with thymine. Adenine complements either thymine or uracil. There is no strand that consists of both thymine and uracil. So, it is a wrong answer.
Option (b) is given that A, C, G, and T are the nitrogenous bases found in the RNA. A, C, G, and T nitrogenous bases are found in the DNA. In RNA, uracil is present in place of thymine. So, it is a wrong answer.
Option (d) is given that A, C, G, and T are the nitrogenous bases found in the RNA. Alanine, cysteine, glycine, and threonine are not found as nitrogenous bases in DNA or RNA. These are amino acids that form codons and each amino acid has multiple codons. So, it is a wrong answer.
The four nitrogenous bases found in RNA are adenine, cytosine, guanine, and uracil (A, C, G, U).
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Biological Science (7th Edition)
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