Lecture 12

Question 1

What does a codon table show?

Answer 1

mRNA sequence from 5’ to 3’

Question 2

What are other ways to express stop codon

Answer 2

ter (termination)

x

Question 3

What is the start codon?

Answer 3

AUG (met)

Question 4

What are the possible stop codons?

Answer 4

UAA or UAG or UGA - Stop

Question 5

What does the 5’ cap and 3’ poly(a) tail do?

Answer 5

post-transcriptional modifications to protect mRNA from 5’ 3’ exonucleases (prevent degradation)

promotes correct splicing of first intron

Question 6

What type of mutation is a codon changed to codon for different AA?

Answer 6

missense. bp substitutions in protein coding regions

Question 7

What is lost if there is a deletion of 3 bp?

Answer 7

loss of aa