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Chapter 15: Q. 14 (page 392)

What processing step enhances the stability of pretRNAs and pre-rRNAs?

a. methylation

b. nucleotide modification

c. cleavage

d. splicing

Short Answer

Expert verified

Option a is correct.

Step by step solution

01

Step 1. Introduction

The process through which information encoded in mRNA is translated into amino acid during protein synthesis is known as translation.

02

Step 2. Explanation of the correct option

Option a is correct because the methyl functional group is added to some bases of pre-RNA and pre-tRNA for stability. RNA methylation is the post-transcriptional level of regulation in which 鈥揅H3 moiety or methyl functional group is added for stability. It regulates the transcription of mRNA, nucleation, stability, and translation and as a result, it overall controls the expression of the proteins.

03

Step 3. Explanation of the incorrect options

Option b is incorrect because the modified nucleotide occurs in all three forms of RNA.

Option c is incorrect because Cleavage refers to division or separation. it may be exonucleolytic - removing the end nucleotide, or endonucleolytic - splitting the strand in two,

Option d is incorrect because splicing is the excision of introns and joining of exons to form mature messenger RNA.

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Most popular questions from this chapter

A scientist introduces a mutation that makes the 60S ribosomal subunit nonfunctional in a human cell line. What would be the predicted effect on translation?

a. Translation stalls after the initiation AUG codon is identified.

b. The ribosome cannot catalyze the formation of peptide bonds between the tRNAs in the A and P sites.

c. The ribosome cannot interact with mRNAs.

d. tRNAs cannot exit the E site of the ribosome.

The RNA components of ribosomes are synthesized in the ________. a. cytoplasm b. nucleus c. nucleolus d. endoplasmic reticulum

Three different bacteria species have the following consensus sequences upstream of a conserved gene.

Table 15.2 Order the bacteria from most to least efficient initiation of gene transcription. a. A > B > C b. B > C > A c. C > B > A d. A > C > B

Three different bacteria species have the following consensus sequences upstream of a conserved gene.


Species A

Species B

Species C

-10

TAATAAT

TTTAAT

TATATT

-35

TTGACA

TTGGCC

TTGAAA

Order the bacteria from most to least efficient initiation of gene transcription.

  1. A > B > C
  2. B > C > A
  3. C > B > A
  4. A > C > B

Figure 15.13Errors in splicing are implicated in cancers and other human diseases. What kinds of mutations might lead to splicing errors? Think of different possible outcomes if splicing errors occur.
See all solutions

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