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
Biological Science
- Which of the following represents a NON-covalent bond? A) phosphodiester bond B) pairing of an adenine and a thymine in double stranded DNA C) binding of an hydroxyl group to the 3' carbon of ribose. D) linkage between a nitrogenous base and a ribose sugar in a nucleotidearrow_forwardWhich of the following conventions is used to specify the sequence of bases in DNA a) The sequence begins with the nucleotide that has a free 3' terminus b) The sequence begins with the nucleotide that has a free 5' terminus c) The sequence begins from the end closest to the first adenine d) The sequence begins from the end closest to the first thyminearrow_forwardplease helparrow_forward
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- b. 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_forward1) Match the nucleotide pictures to their names. A) Cytosine B) Guanine C) Thymine D) Adeninearrow_forward
- 1. . In one sentence each: a) Define a nucleic acid. b) . What is/are the major chemical difference(s) between RNA and DNA? c) How do this difference(s) differentiate RNA from DNA in terms of functions in a livingsystem?arrow_forward9) Which statement is inaccurate (wrong) about mRNA? A) it is double stranded and has thymine B) it can leave the nucleus C) It is single stranded and has uracil D) It is shorter than DNA 10) Which statemment accurately describes DDNA?arrow_forward(True or False) 1.) Fatty acids can be found in ceramides and TAGs. 2.) The adenine base can easily form hydrogen bonds with thymine with the least energy requirement. 3.) The 3'end of nucleic acids structurally has a free OH group bonded to the 3' carbon of the sugar. 4.) Naturally occurring RNA molecules are always single stranded in the cell 5.) The Watson and Crick double stranded DNA structure is always antiparallel.arrow_forward
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