Enzymes – The Helpers of Life! (Simple Notes for Students) with easy hand drawn diagrams

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📌 What Are Enzymes?

• Enzymes are special proteins.

• They speed up chemical reactions in our body.

• Without enzymes, reactions would happen very slowly.

• They are also called biological catalysts.

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📌 Properties of Enzymes

• Work fast – Enzymes make reactions happen quickly.

• Not used up – They don’t get used in the reaction.

• Specific – One enzyme works on one type of reaction.

• Work best at certain temperature and pH.

• Made by living cells (especially in the pancreas, stomach, liver, etc.)

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📌 How Enzymes Work (Mechanism)

• Enzyme has a special shape called an active site.

• A molecule (called substrate) fits into the active site.

• This forms an enzyme-substrate complex.

• The enzyme helps change the substrate into a product.

• After the reaction, the enzyme stays the same and is ready to work again.

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📌 Types of Enzyme Models

1. Lock and Key Model

   • The enzyme is like a lock.

   • The substrate is like a key that fits perfectly.

2. Induced Fit Model

   • The enzyme changes its shape a little to fit the substrate.

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📌 Types of Enzymes (Based on Reaction)

• Amylase – breaks down starch into sugar.

• Protease – breaks proteins into amino acids.

• Lipase – breaks fats into fatty acids and glycerol.

• Catalase – breaks down hydrogen peroxide.

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📌 Factors Affecting Enzyme Activity

1. Temperature

   • Works best at body temperature (around 37°C).

   • Too much heat can damage (denature) the enzyme.

2. pH Level

   • Each enzyme has an ideal pH.

   • Example: pepsin works best in acidic pH.

3. Substrate Concentration

   • More substrate = faster reaction (up to a limit).

4. Inhibitors

   • These are molecules that slow down or stop enzyme activity.

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📌 Enzyme Inhibitors

• Competitive Inhibitor

  • Competes with substrate and blocks the active site.

• Non-Competitive Inhibitor

  • Binds to another part of enzyme and changes its shape.

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📌 Importance of Enzymes in Daily Life

• Help in digestion (breaking down food).

• Used in industries (like making cheese, washing powders).

• Help in DNA copying during cell division.

• Used in medical tests (like glucose tests).

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✅ Final Tip:

Enzymes = Speed + Specificity + Reuse
Learn their working with diagrams for better memory!

Watch This! Enzymes Explained in easy wording

Still confused? Watch this short video that explains enzymes using handwritten notes and diagrams:
👉 Watch on YouTube

  https://youtu.be/HK7ioO30eH8