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Enzymes and Bioenergetics — Revision Notes

CBSE · Class 11 · Biotechnology

Enzymes and Bioenergetics revision notes for CBSE Class 11 Biotechnology: 4 topics in quick points. Part of the CBSE Class 11 Biotechnology syllabus.

58 questions80 flashcards5 concepts

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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?
Key topics in Enzymes and Bioenergetics include Enzymes: Basic Features and Structure, Classification of Enzymes and Isozymes, Enzyme Specificity and Active Site, Models of Enzyme Action. Study these first, then practise questions on each for Class 11 exams.
How should I revise Enzymes and Bioenergetics for Class 11 exams?
Learn the core ideas first, then work through the 58 practice questions on Enzymes and Bioenergetics. Revise 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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