Modification Of mRNA Before Translation

Question 1

What is an intron

Answer 1

Sections of genes that don’t code for amino acids

Question 2

What is an exon

Answer 2

Section of DNA that does code for amino acids

Question 3

What is pre-mRNA

Answer 3

mRNA strands containing both introns and exons made by copying both during transcription

Question 4

What is splicing

Answer 4

Removal of introns from pre-mRNA and exons joined forming mRNA strands, is a post-transcriptional change

Question 5

Where does splicing take place

Answer 5

In the nucleus

Question 6

What is alternative splicing

Answer 6

When certain exons are removed as well as the introns to form dif mRNA strands

Question 7

How can more than one amino acid sequence be produced from one gene

Answer 7

Alternative splicing, produces dif mRNA strands of certain exons as well as introns removed

Question 8

How is antibody heavy chain pre-mRNA modified to produce dif mRNA strands

Answer 8

To produce the heavy chain for a secreted antibody the two exons that code for the part of the heavy chain protein that anchors the antibody to the B cell membrane are removed from the pre-mRNA