EXAM 3- CH 8 REGULATION OF GENE EXPRESSION

Question 1

What is the effect of mutations in lacY or lacZ genes

Answer 1

production of defective enzymes

Question 2

What is the effect of mutations in operator

Answer 2

leads to constitutive expression

Question 3

What is the effect of mutations in the promoter

Answer 3

decrease affinity of RNApol for promoter

Question 4

what is the most important level of control in eukaryotic gene expression

Answer 4

transcriptional control

Question 5

what kind of control: removal of introns and splicing of exons

Answer 5

postranscriptional

Question 6

what kind of control: activator and repressors regulate enhancers and promoters

Answer 6

transcriptional control

Question 7

what kind of control: differences in 5’ cap and poly a tail determine how long a mRNA is available for translation

Answer 7

translational control

Question 8

what kind of control: many proteins function only for a short time before they are degraded/ destroyed by the cell

Answer 8

postranslational