Quiz - Chapter 13 PDF

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1 / 1 point When glucose levels are high, the enzymatic activity of ____________is inhibited. Question options:

a) galactoside transacetylase

b) lac repressor

c) adenylyl cyclase

d) lactose permease

e) β-galactosidase

A ___________ strain of E. coli results in constitutive expression of the lac operon. Question options:

a) lacO+

b) lacI-

c) lacZ-

d) lacY-

e) lacP+

The lac operon is transcribed at high levels when an E. coli cell is in an environment where Question options:

a) glucose levels are low, and lactose levels are high.

b) glucose levels are high, and lactose levels are low.

c) glucose levels are high, and lactose levels are high.

d) glucose levels are low, and lactose levels are low.

___________ is an example of a(n) ____________. Question options:

a) CAP; inducer

b) glucose; repressor

c) cAMP; inducer

d) lac repressor; activator

e) allolactose; corepressor

__________ is an example of a housekeeping gene. Question options:

a) lacO

b) lacZ

c) lacA

d) lacY

e) lacI

f) lacP

Which of the following is an example of an effector? Question options:

a) Activator

b) Terminator

c) Repressor

d) Promoter

e) Inhibitor

The lac repressor binds to the _______ site on the DNA. Question options:

a) lacI

b) lacP

c) lacO

d) lacA

e) CAP site

Sigma factor and RNA polymerase bind to _________. Question options:

a) lacO

b) the CAP site

c) lacI

d) lacA

e) lacP

f) lacZ

Which of the following is a false statement? Question options:

a) Allolactose is an example of an effector molecule.

b) The lac repressor is an example of a regulatory protein.

c) Transcription of the lac operon produces a polycistronic mRNA.

d) A merozygote is a partial diploid strain of E. coli that contains two copies of the lac operon.

e) When glucose levels in the environment are high, cAMP levels in an E. coli cell are high.

Which of the following is produced by the lacZ gene? Question options:

a) lac repressor

b) catabolite activator protein

c) lactose permease

d) galactoside transacetylase

e) β-galactosidase...