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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Chapter 4 Solutions
Biological Science (6th Edition)
- An RNA molecule has the following percentages of bases: A = 27%, U = 38%, C=20%, G = 15%. (A) Is this RNA molecule single-stranded or double stranded? How can you tell? (B) What would be the percentage of each of the bases in the template strand of the DNA that contains the gene for this RNA?arrow_forwardb. What is the difference between the 3' and the 5' ends of a nucleotide chain? C. Do the chains run the same way? d. How are the chains connected? e. Which bases bond to each other? f. What kinds of bonds hold the chain together? 3. What are the main differences between RNA and DNA? 4. Distinguish between the structure of pyrimidines and purines. Explain why adenine bonds only to thymine. 5. Name the five nitrogenous bases in the table below, and put an X in the correct column for each base. Then indicate if the base if found in DNA (D), RNA (R), or both (B) hparrow_forwardAn amino acid is connected to the t-RNA by which of the following functional groups? a. Ester b. Amide c. Carbamate d. Etherarrow_forward
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- It is a pyrimidine derivative that does not form part of nucleic acids.... A) Thymine B) Cytosine C) Adeninearrow_forwardAn American biochemist Erwin Chargaff discovered that in the cells of all organisms he studied, the amount of adenine is always equal to the amount of thymine, and the amount of cytosine is always equal to the amount of guanine. Explain his findings.arrow_forwardWhat is the hydrogen bonding pattern within an alpha helix? a. Lone pair on C=O of residue i to hydrogen on N-H of residue i+3. b. Lone pair on C=O of residue i to hydrogen on N-H of residue i+4. c. Hydrogen of N-H of residue i to hydrogen on N-H of residue i+3. d. Lone pair on C=O of residue i to hydrogen on N-H of residue i+2.arrow_forward
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