21st Dec Molecular Basis of Inheritance Quiz 7 – Punjab Meritorious School Preparation Portal

Welcome to your 21st Dec Molecular Basis of Inheritance Quiz 7 CBT TEST

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The predominant site for control of gene expression in prokaryotes is

Regulated through autocatalytic function of gene

Regulated at translational level

Controlled by activity of Snurps

Controlled by regulating the rate of transcriptional initiation

The number of genes found in chromosome 1 and Y-chromosome fo human being are __________ and ¬¬__________ respectively.

3000 and 3200

2968 and 231

3200 and 2500

1300 and 1800

What percentage of human genome codes for proteins?

>5\%

5-10%

>2\%

< 2 \%

The structural gene that codes for transacetylase enzyme which can transfer acetyl group to ẞ- galactoside is

lac z

lac a

lac i

lac y

Regulation of lac operon by repressor is called

Negative regulation

Positive regulation

Neutral regulation

Both (2) and (3)

Number of base pairs in human genome is approximately

3 × 106

3 × 109

6 × 109

6 × 106

In eukaryotes, the first level of regulation of gene expression is

Transcription

Translation

Transport of mRNA from nucleus to the cytoplasm

Regulation of splicing

Number of structural genes in tryptophan operon is

Which of the following genes provides attachment site for RNA polymerase?

Structural gene

Promoter gene

Regulator gene

Operator gene

A polycistronic structural gene of lac operon is regulated by

A common promoter and multiple operator

Promotor gene only

A common promoter and regulatory genes

Regulatory gene only

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