According to the repressor of lac operon which of the following are false?

The lac operon is found only in prokaryotes and consists of structural genes and a promoter and operator. Which of the following statements explains why we study the lac operon?

A

It represents a principal means by which gene transcription can be regulated.

B

It explains how baby mammals utilize lactose from their mothers as they nurse.

C

It illustrates how RNA is processed after it is transcribed.

D

It illustrates possible control of the cell cycle and may lead to an understanding of cancer.

Consider the following statements and choose the correct answer:
1. The structural genes direct the synthesis of cellular proteins through messenger RNA (mRNA)
2. The promoter gene determines whether or not the structural genes are to be repressed by the repressor
3. The regulator gene directs the synthesis of a protein which may be an active repressor or an inactive repressor

A

1, 2 and 3 are true

B

Only 2 and 3 are true

C

Only 1 and 3 are true

D

Only 1 and 2 are true

In a mero-diploid you have one I- and one I+ Repressor gene in the two lac operons. I+ is wild type while I- is a mutant which produces a repressor that doesn’t bind. What would be the functionality of the diploid?

A

Function normally

B

Will be non-functional

C

May or may not function

D

Will have impaired functioning

Lac repressor dissociates from its operator when the repressor binds to ____________

A

Heat shock module

B

Promoter

C

Inducer

D

Catabolite activator site

A Lac repressor is a tetramer repressed when bound to the inducer. The trp repressor is a ____________________

A

Dimer inactivated when bound to the inducer

B

Dimer activated on inducer binding

C

Tetramer inactivated on inducer binding

D

Tetramer activated on inducer binding

Repressor protein binds to which site in Lac Operon model?

A

Regulator

B

Promoter

C

Operator

D

Any of the above

What is the regulation of a lac operon by a repressor known as?

A

Neutral regulation

B

Positive regulation

C

Mixed regulation

D

Negative regulation

If the lac operon of the genome of bacteria is always active it has a defect in which region of the operon?

A

i

B

o

C

Promoter

D

Structural gene

If there is an insertion mutation in the operator of the lac operon, the expression of the lac structural gene will be __________

A

Resistant to catabolic expression

B

Unexpressed

C

Constitutively expressed

D

Permanently disabled

Lac, a scarlet resinous secretion of tiny insects referred to as lac insects, which produces a gum like secretion used in the production of various commodities such as gums, dyeing fabrics, bangle making, wood polishing etc. Which of the following state is the largest producer of LAC in India?

A

Jharkhand

B

Chhattisgarh

C

Madhya Pradesh

D

Gujarat

According to the repressor of lac operon which of the following are false?

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