22nd Dec Molecular Basis of Inheritance Quiz 8 – Punjab Meritorious School Preparation Portal

Welcome to your 22nd Dec Molecular Basis of Inheritance Quiz 8 CBT TEST

Fill the Details mentioned below and Attempt the Test.

Name

Email

School Name with City

Phone Number

For lactose metabolism

all three gene products are required

only regulator gene products are required

only Beta-galactosidase are required

Beta-galactosidase and permease are required

The inducer of lac operon is:

Beta galactosidase

Galactose

Lactose

Glucose

Lac operon will be switched on when

lactose is less in the medium

glucose is enough in the medium

lactose is less than glucose

lactose is more than glucose

(A) Glucose or galactose may bind with the repressor and inactivate it

(B) In the absence of lactose, the repressor binds with the operator region

(C) The z-gene codes for permease

(D) This was elucidated by Francois Jacob and Jacques Monod

The correct statements are

(B) and (C)

(A) and (C)

(B) and (D)

(A) and (B)

Promoter regions of lac operon can be accessed by

RNA polymerase

DNA polymerase

Proteins

All of these

In lac operon

3 structural, 1 operator and 2 promoter genes are present

3 structural, 1 operator and 1 promoter genes are present

3 structural, 2 operator and 1 promoter genes are present

3 structural, 1 operator and 3 promoter genes are present

Select the correct match:

Alec Jeffreys-Streptococcus pneumoniae

Alfred Hershey and Martha Chase - TMV

Matthew Meselson and F. Stahl-Pisum sativum

Francois Jacob and Jacques Monod-Lac operon

In the lac operon model, lactose molecules function as: -

inducers, which bind with the operator gene

repressors, which bind with the operator gene

inducers, which bind with the repressor protein

corepressors, which bind with repressors protein

The lac in lac operon refers to

lactose but not lactase

lactase but not lactose

lactobacillus but not lactose

lactose as well as laevorotatory

Column-1 Column-2
I. Operator site A. Binding site for RNA polymerase
II. Promoter site B. Binding site for repressor molecule
III. Structural gene C. Codes for enzyme protein
IV. Regulator gene D. Code for repressor molecules

The correct match is

I-B, II-A, III-C. IV-D

I- B, II-A, III-D, IV-C

I-D, II-CIII-A IV-B

I-B, II-C, III-A, IV-D

Please fill in the comment box below.

Time is Up!

Time's up