Complete NEET Biology Preparation 

Concept Clarity | NCERT Mastery | Proven Results

About the Educator

Trisha Chatterjee

NEET Biology Faculty | 8+ Years of Teaching Experience

·       Mentored 100+ NEET aspirants with excellent results

·       Multiple students scored 320+/360 in Biology

·       Highest score achieved by student: 350/360

·       Ex-Faculty at reputed institutes (Narayana group of Institutions, Sanjeevani Institute)

·       Strong expertise in NCERT-based conceptual teaching

·       Known for making complex topics simple and easy to remember

🎯 Course Highlights

·       Complete NCERT-focused preparation

·       Concept + MCQ integrated teaching approach

·       Special focus on difficult and high-weightage topics

·       Smart tricks & memory techniques for quick revision

·       Regular practice + doubt-solving sessions

·       Personalized guidance for each student

📚 What Students Will Get

·       Short & crisp handwritten/typed notes

·       Important NCERT line-by-line explanations

·       Practice of previous year NEET questions

·       Weekly chapter-wise tests

·       Full syllabus mock tests

·       Continuous performance analysis & improvement

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Why Join This Course?

✔️ Simplified explanation of toughest topics

✔️ Focus on high-weightage & confusing concepts

✔️ Regular practice with NEET-level MCQs

✔️ Personal guidance & doubt-solving

✔️ Proven results with 320+ scores

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      Sample notes

Chapter- Molecular Basis Of Inheritance

                                          Topic- Lac Operon

Lac Operon – Complete NCERT Line-by-Line Notes

NCERT Line

“In prokaryotes, the regulation of gene expression is mainly at the level of initiation of transcription.”

Explanation

Control happens before transcription starts

Main point: whether RNA polymerase will work or not

NCERT Line

“This is because transcription and translation occur simultaneously.”

Explanation

In bacteria, no nucleus → both processes happen together

So controlling transcription = controlling protein formation

NCERT Line

“The lac operon is an inducible operon.”

Explanation

Inducible = normally OFF

Turns ON only when needed (when lactose is present)

NCERT Line

“It is switched on in the presence of inducer.”

 Explanation

Inducer = molecule that activates system

In lac operon, inducer is → Allolactose (from lactose)

NCERT Line

“The lac operon consists of a regulator gene and three structural genes (z, y, a).”

 Explanation

i gene (regulator) → makes repressor

Structural genes:

Z → breaks lactose

Y → brings lactose inside

A → minor role (transacetylase)

NEET Practice Questions: Lac Operon

Q1.The lac operon is:

A. Repressible system

B. Inducible system

C. Constitutive system

D. Enhancer system

✅ Answer: B

Explanation:

Lac operon is OFF by default and becomes active only in presence of lactose → inducible.

Q2.Which gene of lac operon codes for permease?

A. lac Z

B. lac Y

C. lac A

D. lac I

✅ Answer: B

Explanation:

lac Z → β-galactosidase

lac Y → permease

lac A → transacetylase