Biomolecules Class 11 Part 1: Introduction & Chemical Composition Analysis (NEET Notes + MCQ)

 Biomolecules is one of the most important chapters in Class 11 Biology for NEET preparation. It deals with the chemical substances present in living organisms and their role in life processes.

In this part, we will understand the basic concept of biomolecules and how scientists analyze the chemical composition of living tissues using techniques like acid hydrolysis. This forms the foundation for understanding carbohydrates, proteins, lipids, and nucleic acids.

📘 📌 MAIN CONTENT STRUCTURE (FOLLOW THIS)

🔬 What are Biomolecules?

• Biomolecules are chemical compounds found in living organisms
• Examples: carbohydrates, proteins, lipids, nucleic acids

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🧪 How to Analyse Chemical Composition?

👉 Scientists follow a step-by-step process:

🔹 Step 1: Tissue Collection

• Take plant/animal tissue

🔹 Step 2: Grinding

• Grind tissue using mortar and pestle

🔹 Step 3: Acid Treatment

• Add Trichloroacetic Acid (TCA)

🔹 Step 4: Filtration

• Two fractions formed:

✔ Acid soluble pool
✔ Acid insoluble fraction

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⚗️ Acid Soluble Pool

• Small molecules
• Amino acids
• Sugars
• Nucleotides

---

🧬 Acid Insoluble Fraction

• Large molecules
• Proteins
• Polysaccharides
• Nucleic acids

---

📊 Important Observation

• Living tissue contains both organic and inorganic compounds
• Carbon, hydrogen, oxygen, nitrogen are major elements

📘 📌 MAIN CONTENT STRUCTURE (FOLLOW THIS)

🔬 What are Biomolecules?

• Biomolecules are chemical compounds found in living organisms
• Examples: carbohydrates, proteins, lipids, nucleic acids

---

🧪 How to Analyse Chemical Composition?

👉 Scientists follow a step-by-step process:

🔹 Step 1: Tissue Collection

• Take plant/animal tissue

🔹 Step 2: Grinding

• Grind tissue using mortar and pestle

🔹 Step 3: Acid Treatment

• Add Trichloroacetic Acid (TCA)

🔹 Step 4: Filtration

• Two fractions formed:

✔ Acid soluble pool
✔ Acid insoluble fraction

---

⚗️ Acid Soluble Pool

• Small molecules
• Amino acids
• Sugars
• Nucleotides

---

🧬 Acid Insoluble Fraction

• Large molecules
• Proteins
• Polysaccharides
• Nucleic acids

---

📊 Important Observation

• Living tissue contains both organic and inorganic compounds
• Carbon, hydrogen, oxygen, nitrogen are major elements

📘 📌 MAIN CONTENT STRUCTURE (FOLLOW THIS)

🔬 What are Biomolecules?

• Biomolecules are chemical compounds found in living organisms
• Examples: carbohydrates, proteins, lipids, nucleic acids

---

🧪 How to Analyse Chemical Composition?

👉 Scientists follow a step-by-step process:

🔹 Step 1: Tissue Collection

• Take plant/animal tissue

🔹 Step 2: Grinding

• Grind tissue using mortar and pestle

🔹 Step 3: Acid Treatment

• Add Trichloroacetic Acid (TCA)

🔹 Step 4: Filtration

• Two fractions formed:

✔ Acid soluble pool
✔ Acid insoluble fraction

---

⚗️ Acid Soluble Pool

• Small molecules
• Amino acids
• Sugars
• Nucleotides

---

🧬 Acid Insoluble Fraction

• Large molecules
• Proteins
• Polysaccharides
• Nucleic acids

---

📊 Important Observation

• Living tissue contains both organic and inorganic compounds
• Carbon, hydrogen, oxygen, nitrogen are major elements

📌 CONCLUSION:

Biomolecules form the chemical basis of life, and understanding their composition is essential for NEET preparation. The analysis of chemical components into acid soluble and insoluble fractions helps us classify biomolecules based on size and function.

This topic builds the foundation for studying major biomolecules like carbohydrates, proteins, lipids, and nucleic acids in detail.

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🏠 Index: Biomolecules Notes                                        ➡️ Next: Carbohydrates (Part 2)