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A : Lac operon exerts negative control o...

A : Lac operon exerts negative control only.
R: The operator is occupied by aporepressor during regulation.

A

If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark

B

If both Assertion & Reason are true and the reason is not the correct explanation of the assertion , then mark

C

If Assertion is ture statement but Reason is false, then mark.

D

If both Assertion and Reason are false statements, then mark.

Text Solution

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The correct Answer is:
D
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Lac operan exerts negative control when (1). Repressor binds promoter gene. (2) Repressor binds operator gene. (3). Inducer binds repressor. (4) Repressor binds with structural gene.

In lac-operon , which protein is not regulated by the repressor?

Lactose (Lac) operon is regulated by :

Regulation of lac operon by repressor is called

In lac operon,the regulator gene codes for

Assertion :- Lac opertor is present only in lac operon & it interact specifically with lac repressor only. Reason : Each operon has its specific operator & specific repressor.

In the following questions , a statement of assertion (A) is followed by a statement of reason (R). A: Each operon has its specific operator. R : Lac operator is present in the lac operon and it interacts specifically with structural genes.

A: Operator gene is functional when it is not blocked by repressor. R: Regulator gene produces active protein only which acts on operon system in E.coil.

Read statements a-d . (a) In transcription, adenosine pairs with uracil (b) Regulation of lac operon by repressor is positive regulation (c) Human genome has approximate 50,000 genes (d) Haemophilia is sex-linked recessive disease How many of above statement are correct ?

AAKASH INSTITUTE-MOLECULAR BASIS OF INHERITANCE -ASSIGNMENT (SECTION -D) (Assertion -Reason Type Questions)
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  11. A : Catalytic functions were assigned to RNA molecule during evolut...

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  12. A : Kornberg enzyme is asscoitated with the removal of primers an...

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  13. A : Wobbling reduces the number of tRNAs required for polypeptides s...

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  14. A : Unknown DNA after hybridization with VNTR probe, the autoradiogr...

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  15. A: Polypeptide sequence are dictated by DNA and represented by mRNA. ...

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  16. A: Triplet genetic code can be confirmed by frame shift mutations. ...

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  17. A : Lac operon exerts negative control only. R: The operator is occ...

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  18. A : Single DNA depenedent RNA polymerase catalyases transcription of...

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  19. A : Sigma factor of RNA polymerase recognizes the start single regio...

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  20. A: HGP was completed in 2003 by sequencing all genes of all chrom...

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