Gene Expression

Question 0

Mutations in lac Operon

I-

Answer 0

prevents repressor from binding

recessive) (on all the time

Question 1

constitutive Mutation

Answer 1

prevents binding of repressor to operator

Question 2

Mutations in lac operon:

Oc

Answer 2

prevents repressor from binding

dominant) (on all the time

Question 3

mutations in lac operon

Is Superrepressor

Answer 3

repressor stays bound to operon all the time

dominant) (on all the time

Question 4

Mutations in lac operon:

Z-

Answer 4

Non-functional galactosidase

doesn’t affect expression, only products

Question 5

Compact DNA (chromatin)

Answer 5

Does not allow transcription to happen

Question 6

Constitutive Expression

Answer 6

Continuous transcription
no regulation, always being expressed
products needed in large quantities

Question 7

CRP

Answer 7

cAMP Receptor Protein

Question 8

CAP

Answer 8

catabolic activator protein

helps activate activator protein but need cAMP to activate

Question 9

trp Operon

Answer 9

synthesized amino acid, tryptophan

• negative repressible control, repressed by presence or tryptophan
• structural genes encode enzymes of the tryptophan synthesis pathway
• products synthesis substrate (tyrptophan) tryptophan turns off operon