Molecular Biology MCQ 03: lac Operon with Answer Key (Introductory)


gene regulation mcq

Molecular Biology MCQ on lac Operon – Part 1 (Introductory)
(Molecular Biology MCQ-03)

(Biology / Life Sciences MCQ: Multiple Choice Questions in Molecular Biology)

(Sample/Model/Practice Questions for CSIR JRF/NET Life Science Examination, ICMR JRF Exam, DBT BET JRF Exam, GATE BT and XL Exam, ICAR JRF NE Exam, PG Entrance Exam, JAM Exam, GS Biology Exam and Medical Entrance Exam)

Welcome to Molecular Biology MCQ-03

This question set on Molecular Biology: lac Operon (Part 1 - Introduction) consists of 15 questions in MCQ format. Please select the correct answer and at the end test, you have to click on 'SUBMIT' button to see your Score and the Correct Answers. 

1.

Which of the following acts as the inducer of lac operon is?

2.

The sequence of the structural gene in lac operon is:

3.

If the repressor of the lac operon binds to the operator, it will lead to:

4.

If activator binds to the repressor, it will prevent

5.

In the lac operon, under which of the following conditions will the lac genes be transcribed at high levels?

6.

The cleavage of X-gal by β galactosidase enzyme produce the blue coloured 5-bromo-4-chloro-3-hydroxy indone and ________.

7.

The gene product of LacA gene in Lac-operon is:

8.

The gene product of LacZ gene in Lac-operon is:

9.

The lac operon is a:

10.

The gene product of LacY gene in Lac-operon is:

11.

A mutation occurs in the lac repressor protein such that it can no longer bind to lactose. What effect will this mutation have on the expression of proteins of the lac operon in the presence of lactose?

12.

Choose the correct option from the following regarding the lac operon in E. coli?

13.

Which of the following genes is not a structural gene of the lac operon?

14.

The lac operon:

15.

Pribnow box is the component of _______


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|   lac Operon MCQ Part 2   |   trp Operon MCQ   |


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Biology / Life Sciences MCQ: Molecular Biology MCQ02 on Cell Signaling (Signal Transduction): (Multiple Choice Questions / Model Questions / Sample Questions in Molecular Biology with detailed answer key, explanations and references for preparing CSIR JRF NET Life Science Examination and also for other competitive examinations in Life Science / Biological Science such as ICMR JRF Entrance Exam, DBT BET JRF Exam, GATE (XL) Life Science Exam, GATE (BT) Biotechnology Exam, ICAR JRF Exam, University PG Entrance Exam, JAM Exam, GS Biology Exam, GRE, Medical Entrance Examination etc. This set of practice questions will help to build your confidence in Molecular Biology to face the real examination.

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