The insertion of transposable elements within a gene can cause mutations. Transposable elements disrupt the continuity of the gene. However, introns also disrupt the continuity of the gene, but the gene can be functional. Why the gene inactivation is caused by only the presence of transposable elements but not introns. Concept introduction: Transposable elements are known as stretches of DNA molecules and they can move from one place to another place. Generally, transposable elements are inserted into the other DNA material, for examples, the chromosome, the plasmid, and the viral genome. Transposable elements usually do not contain the origin of replication, therefore, they replicate within the host DNA into which transposable elements are inserted. When the host DNA replicates , the transposable elements also replicate along with them. The process of the movement of the transposable elements is known as transposition. Insertion sequences (IS) and transposons are two important types of transposable elements.

Question

Once transcribed, the length of the mRNA for gene X is usually 1000 nucleotides long in your favorite bacterial species. After mutagenizing the bacteria, you notice that the mRNA is 800 nucleotides long. Which of the following could be the mutated that would explain your observations? a mutation introducing a new rut site in gene X a mutation in the Shine-Dalgarno sequence a mutation in the polyA addition site a mutation in the operator

Answer 1

Question

Chapter 10, Problem 4AQ

Summary Introduction

To discuss:

The insertion of transposable elements within a gene can cause mutations. Transposable elements disrupt the continuity of the gene. However, introns also disrupt the continuity of the gene, but the gene can be functional. Why the gene inactivation is caused by only the presence of transposable elements but not introns.

Concept introduction:

Transposable elements are known as stretches of DNA molecules and they can move from one place to another place. Generally, transposable elements are inserted into the other DNA material, for examples, the chromosome, the plasmid, and the viral genome. Transposable elements usually do not contain the origin of replication, therefore, they replicate within the host DNA into which transposable elements are inserted. When the host DNA replicates, the transposable elements also replicate along with them. The process of the movement of the transposable elements is known as transposition. Insertion sequences (IS) and transposons are two important types of transposable elements.

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Once transcribed, the length of the mRNA for gene X is usually 1000 nucleotides long in your favorite bacterial species. After mutagenizing the bacteria, you notice that the mRNA is 800 nucleotides long. Which of the following could be the mutated that would explain your observations? a mutation introducing a new rut site in gene X a mutation in the Shine-Dalgarno sequence a mutation in the polyA addition site a mutation in the operator

Which of the following statements best describes the promoter of a protein-coding gene? A. The promoter is a protein that recruits RNA polymerase. B. The promoter is part of the RNA molecule itself. C. The promoter is a site found on RNA polymerase. D. The promoter contains the AUG start codon. E. The promoter is a nontranscribed region of a gene.

Give two DIFFERENT examples of how the following can occur:a. A point mutation in an exon that is silent.b. A point mutation in an exon that is NOT silent.c. A point mutation in an intron that is NOT silent.d. A point mutation in a promoter that is NOT silent.