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

Introduction:
The five nitrogenous bases consisting of nitrogen-containing molecule used in the construction of nucleotides. The nucleotides are the building blocks of the nucleic acids like DNA (deoxyribonucleic acid) and RNA (ribonucleic acid). The DNA and the RNA are the genetic material of an organism.
Answer to Problem 1TYK
Correct answer:
Adenine, cytosine, guanine, and uracil (A, C, G, U) are the four nitrogenous bases which are found in the RNA.
Explanation of Solution
Explanation for the correct answer:
Option (c) is given that A, C, G, and U are the nitrogenous bases found in the RNA. Since 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 (cytosine, guanine, thymine, and uracil) are the nitrogenous bases found in the RNA. Since, in the 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 an incorrect option.
Option (b) is given that A, C, G, and T (adenine, cytosine, guanine, and thymine) are the nitrogenous bases found in the RNA. Since, A, C, G, and T nitrogenous bases are found in the DNA. In RNA, uracil is present in place of thymine. So, it is an incorrect option.
Option (d) is given that alanine, threonine, glycine, and cysteine are the nitrogenous bases found in the RNA. Since, 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 an incorrect option.
Hence, options, (a), (b), and (d) are incorrect.
Thus, it can be concluded that the four nitrogenous bases found in RNA are adenine, cytosine, guanine, and uracil (A, C, G, U).
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Chapter 4 Solutions
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