Question

Which compound has a similar function to allolactose, but will not be metabolized by the cell?...

Which compound has a similar function to allolactose, but will not be metabolized by the cell?

a. IPTG

b. Lactose

c. X-Gal

d. Glucose

The repressor that acts on the lac operon.

a. LacI

b. CRP

c. Glucose

d. Betagalactosidase

The ligand which is binds to the lac activator protein.

a. allolactose

b. lactose

c. glucose

d. cAMP

The activator and the repressor associated with the lac operon both contain which of the following? (select all that apply)

a. DNA binding site

b. transcriptional-activator site

c. ligand-binding site

d. catalytic site

The lac operon has been identified in humans and functions similarly to the lac operon of prokaryotes.

a. true

b. false

The activator protein which controls expression of the lac operon also controls expression of several other operons involved in sugar catabolism.

a. true

b. false

Science   Biology   
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Homework Answers

Answer #1

Ans-1) a) IPTG

Explaination:IPTG is compound which has similar function as allolactose that is induction of lac operon but IPTG is semisynthetic and cannot be degraded by cellular enzymes so dot metabolised angd this made it useful in various lab experiments.

Ans-2)a) lacI

Lac I is represor protein that bind to operator in absence of inducer and stop the expression of lac operon

Ans-3)d)cAMP

Explaination:cAMP binds to the activator protein CAP, and  promotes the binding of RNA polymerase to the promoter.

Ans-4)a) DNA binding site

Both repressor and activator protein bind to operator region of operon in order to prohibit or allowed the binding of rna polymerase to promoter respectively.

Ans-5) false

Lac operon absent in humans.

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