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Lac Operon Questions

Practice 7 Lac Operon questions with detailed answers and explanations. Free MCQs, PYQs, and mock test questions for NEET, JEE, GATE, SSC and more.

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Practice by Exam:Biology(6)Botany(1)

About Lac Operon — practice questions, PYQs & concepts

Lac Operon is a frequently-tested topic on Biology, Botany. ExamTest.live currently lists 7 Lac Operon questions spanning previous-year papers from 2026 to 2026, each with worked solutions and a step-by-step explanation. Use the filters on this page to focus on a specific exam, difficulty level or year — every answer key is free, no sign-up required.

Lac Operon weight in competitive exams

Across our Lac Operon question bank, the largest sources are Biology (6) and Botany (1). Click any exam chip above to drill down to that exam-specific question set.

How to use this page

  • Start easy: 2 easy Lac Operon questions are available — build fluency before moving up.
  • Target weak years: Use the year filter to focus on the most recent 2026 paper or older PYQs you have not attempted.
  • Time yourself: Every question shows the average solve time so you can benchmark your speed against other students.
  • Read every explanation: Even on questions you got right — the explanation often surfaces a faster approach you can reuse.

All Lac Operon Questions(1–7 of 7)

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Q1mediummcqBiologyNEET 20192026
0% accuracy
Match the following genes of the Lac operon with their respective products:(a) gene (i) -galactosidase(b) gene (ii) Permease(c) gene (iii) Repressor(d) gene (iv) Transacetylase
Q2hardmcqBiologyNEET (UG) 20182026
Select the correct match:
Q3hardmcqBiologyNEET 20222026
In an E. coli strain the i gene gets mutated and its product cannot bind the inducer molecule. If the growth medium is provided with lactose, what will be the outcome?
Q4easymcqBiologyNEET 20232026
Match List I with List II regarding the Lac Operon:| List I | List II || :--- | :--- || A. Gene 'a' | I. -galactosidase || B. Gene 'y' | II. Transacetylase || C. Gene 'i' | III. Permease || D. Gene 'z' | IV. Repressor protein |
Q5easymcqBotanyNEET 2024 R1@NUM: 1332026
The lactose present in the growth medium of bacteria is transported to the cell by the action of:
Q6mediummcqBiologyBiology
Select the two correct statements about the lac operon:(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 -gene codes for permease.(d) This was elucidated by Francois Jacob and Jacques Monod.
Q7mediummcqBiologyBiology
Which enzyme/s will be produced in a cell in which there is a non-sense mutation in the lac Y gene?

Frequently Asked Questions

How many Lac Operon questions are on ExamTest.live?▼
We have 7 Lac Operon questions spread across 1 pages, covering easy, medium, and hard difficulty levels with detailed explanations.
Are Lac Operon MCQs free?▼
Yes. All Lac Operon questions, answers, and explanations on ExamTest.live are completely free. No account or subscription required.
Which exams include Lac Operon questions?▼
Lac Operon questions are commonly asked in Biology, Botany. You can filter by exam using the links above.
How do I practice Lac Operon questions effectively?▼
Start with easy questions to build confidence, then tackle medium and hard ones. Use the filter buttons to sort by difficulty. Reveal the answer only after attempting each question, and read the explanation thoroughly.