Biology
Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 13, Problem 1MC
Summary Introduction

Introduction: Ribonucleic acid (RNA) is a polymer of nucleotides, which is directed by the DNA for the synthesis of proteins. It is made up of ribose sugar and nitrogenous bases, namely adenine, guanine, cytosine, and uracil. RNA is structurally similar to DNA but differs on the basis of sugar, strand, and nitrogen base.

Expert Solution & Answer
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Answer to Problem 1MC

Correct answer: Option b. “messenger RNA”.

Explanation of Solution

Reason for the correct answer:

Option b. is given as “messenger RNA”.

Messenger RNA (mRNA) functions as an information carrier from DNA in the nucleus to the ribosome in cytoplasm of the cell. This information is used by the cell to direct the synthesis of proteins. Group of three bases in mRNA is called codons that specify which amino acid will be incorporated into a protein.

Hence, option b. is correct.

Reasons for incorrect answers:

Option a. is given as “ribosomal RNA”.

Ribosomal RNA is responsible for the production of ribosomes at which polypeptide chains are formed during translation. Hence, option a. in incorrect.

Option c. is given as “transfer RNA”.

Transfer RNA transfers the amino acid to the ribosomal unit in translation process by which the information in mRNA is translated into protein molecules. Hence, option c. is incorrect.

Option d. is given as “noncoding RNA”.

Non-coding RNA is transcribed from DNA, but is not translated into proteins.

Hence, option d. is incorrect.

Hence, options a., c., and d. are incorrect.

Conclusion

Messenger RNA carries the genetic information from DNA to the cytoplasm which is then used for protein synthesis.

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Students have asked these similar questions
Which of the following describes the interactions between a codon and an anticodon? A. A codon and an anticodon become covalently bonded together due to the activity of the ribosome. B. A codon and anticodon do not come into direct contact because codons are in the nucleus but anticodons are in the cytoplasm. C. A codon and anticodon are attracted to each other due to hydrogen bonding. D. A codon and an anticodon are linked together by an amino acid. ..
Which of the following is true about the three major classes of RNAs in the cell: mRNAs, tRNAs, and rRNAs? A. mRNAs encode polypeptide chains. B. tRNAs are structural components of the ribosome. C. rRNAs are adapter molecules that translate the information on an mRNA into a polypeptide sequence. D. mRNAs can also encode tRNAs and rRNAs.
Which of the following best describes tRNA? a. Provides the instructions for the amino acid sequence of a polypeptide b. Complexes with ribosomal proteins to form ribosomes c. Used for eukaryotic RNA processing d. Transports amino acids to ribosomes during translation
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