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Enzymes and Bioenergetics

CBSE · Class 11 · Biotechnology

Quick revision notes for Enzymes and Bioenergetics — CBSE Class 11 Biotechnology. Key concepts, formulas, and definitions for last-minute revision.

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Key Topics to Revise

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1. Enzymes: Basic Features and Structure

  • Enzymes catalyse biochemical reactions in vivo and in vitro.
  • Enzymes are highly specific and have great catalytic power.
  • All enzymes are proteins except a small group of catalytic RNA molecules called ribozymes.
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2. Classification of Enzymes and Isozymes

  • The International Union of Biochemistry adopted enzyme classification in 1964 based on the type of reaction catalysed.
  • Enzymes are classified into 6 major classes, and translocase was later added as a 7th class.
  • Oxidoreductases catalyse oxidation-reduction reactions.
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3. Enzyme Specificity and Active Site

  • Enzymes are highly specific because of their substrate-binding properties and the arrangement of catalytic groups.
  • The active site is a small, clearly defined pocket or cleft on the enzyme where the substrate fits.
  • The active site has a three-dimensional structure.
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4. Models of Enzyme Action

  • In 1894, Emil Fischer proposed the Lock and Key Model.
  • In this model, the active site is pre-shaped and complementary to the substrate.
  • The substrate fits into the enzyme like a key fits into a lock.

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Full Notes

Key Concepts

Enzymes catalyse biochemical reactions bothAll enzymes are proteins exceptMany enzymes need cofactors for activityEnzymes are classified into seven classesIsozymes are multiple molecular forms

Frequently Asked Questions

What are the important topics in Enzymes and Bioenergetics for CBSE Class 11 Biotechnology?
Enzymes and Bioenergetics covers several key topics that are frequently asked in CBSE Class 11 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Enzymes and Bioenergetics — CBSE Class 11 Biotechnology?
Understand the core concepts first, then work through the 58 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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