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Read the following statements with respect to lac operon, and select the correct option.

A. It has three structural genes.

B. Glucose can act as an inducer.

C. Repressor protein acts in the presence of lactose.

D. Repressor is synthesized by the regulator gene.

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Important Questions on Molecular Basis of Inheritance

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Biology Crash Course NEET>Chapter 28 - Molecular Basis of Inheritance>Level 2>Q 61

The figure shows the structure of lac operon with the four parts labelled A, B, C, and D. Select the option in which the parts are identified correctly.

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Biology Crash Course NEET>Chapter 28 - Molecular Basis of Inheritance>Level 3>Q 1
What was the key finding from Griffith's experiments using live and heat-killed pathogenic bacteria?
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Biology Crash Course NEET>Chapter 28 - Molecular Basis of Inheritance>Level 3>Q 2
In the DNA molecule:
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Biology Crash Course NEET>Chapter 28 - Molecular Basis of Inheritance>Level 3>Q 3
Which one of the following is wrongly matched?
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Biology Crash Course NEET>Chapter 28 - Molecular Basis of Inheritance>Level 3>Q 4
In Glycine, amino acid is coded by :
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Biology Crash Course NEET>Chapter 28 - Molecular Basis of Inheritance>Level 3>Q 5
In a DNA fragment, there are 8 turns, with 40% of the bases are cytosine. 'What would be the total number of hydrogen bonds present in this DNA fragment?
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Biology Crash Course NEET>Chapter 28 - Molecular Basis of Inheritance>Level 3>Q 6
Identify A, B, C and D in the given diagram of mRNA.
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Biology Crash Course NEET>Chapter 28 - Molecular Basis of Inheritance>Level 3>Q 8

Match the column I with column II for genes of lac operon and select the correct option.

Column - I Column - II
A. Z gen (i) Transacetylase
B. Y gene (ii) Repressor
C. A gene (iii) Î²- Galactosidase
D. i gene (iv) Permease