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 Nature of Enzyme Action Class 11 Biology Notes PDF | CBSE & NEET Nature of Enzyme Action (Easy NEET Notes) Nature of Enzyme Action: Step-by-step process showing enzyme-substrate complex formation, catalysis, and product release for CBSE Class 11 and NEET Biology. -Dr.Sanjaykumar Pawar  What is an Enzyme? Enzyme (E) = A biological catalyst that speeds up chemical reactions. Substrate (S) = The substance on which the enzyme acts. Product (P) = The final substance formed after the reaction. Basic Enzyme Reaction E + S → ES → EP → E + P Meaning of each step: E + S = Enzyme meets the substrate. ES = Enzyme-Substrate Complex is formed. EP = Enzyme-Product Complex is formed after the reaction. E + P = Product is released and the enzyme remains unchanged. NEET Point: The enzyme is not consumed during the reaction and can be used again. Line-by-Line Explanation Line 1: "Each enzyme (E) has a substrate (S) binding site in its molecule." Easy Meaning...

  Chemical Reactions and Enzymes – Easy Line-by-Line Notes (NEET Beginner Level) Chemical reactions and enzymes explained with simple diagrams for CBSE Class 11 Biology students. 1. What is a Chemical Reaction? A chemical reaction is a process in which old chemical bonds break and new bonds are formed . As a result, new substances (products) are produced. Example: Ba(OH)₂ + H₂SO₄ → BaSO₄ + 2H₂O NEET Point: Chemical reaction = Breaking + Formation of bonds . 2. Types of Changes in Chemical Compounds A. Physical Change Only the shape, size, or state changes. No chemical bonds are broken or formed. No new substance is produced. Examples Ice → Water Water → Water vapour Cutting paper Breaking glass Remember: Physical change = No new substance. B. Chemical Change Old bonds break and new bonds form. A new substance is produced. This process is called a chemical reaction . Examples Burning wood Rusting of iron Digestion of food Hydrolysis of starc...

  Easy NEET Notes – Biomolecules Types   CBSE Class 11 Biomolecules: Amino acids, lipids, and nucleic acids explained with clear diagrams for easy exam preparation. - Dr.Sanjaykumar Pawar  1. Proteinaceous Amino Acids What is an Amino Acid? Amino acids are the building blocks of proteins . Every amino acid contains: Amino group (–NH₂) Carboxyl group (–COOH) Hydrogen atom (H) R group (Side chain) → makes each amino acid different. R Group (Side Chain) The R group decides the type and properties of an amino acid. Examples: Glycine (Gly) → R = Hydrogen (H) → Simplest amino acid. Alanine (Ala) → R = Methyl group (–CH₃). Serine (Ser) → R = Hydroxymethyl group (–CH₂OH). NEET Tip: R group is responsible for the unique nature of every amino acid. Types of Amino Acids (Based on Amino & Carboxyl Groups) 1. Acidic Amino Acids Have more carboxyl (–COOH) groups than amino groups. Carry a negative charge. Example: Glutamic acid. Easy T...

 Ribosomes CBSE Class 11: MCQs, Case Study & Assertion Reason Questions  Structure and function of ribosomes showing 70S and 80S subunits involved in protein synthesis.   - Dr.Sanjaykumar Pawar  Ribosomes  1. What are Ribosomes? Ribosomes are tiny granular (grain-like) structures present inside cells. They were first observed under an electron microscope. They were discovered by in 1953 . Under the electron microscope, they appear as dense particles. 2. Composition of Ribosomes Ribosomes are made up of: Ribosomal RNA (rRNA) Proteins Therefore, ribosomes are ribonucleoprotein particles . 3. Membrane Around Ribosomes Ribosomes are not surrounded by any membrane . Hence, they are called non-membranous cell organelles . 4. Function of Ribosomes Ribosomes are the site of protein synthesis . They help in translating genetic information into proteins. Therefore, ribosomes are known as the "Protein Factories of the Cell." Types of Ribos...

Structure of Neuron – Easy NEET Notes  - Dr.Sanjaykumar pawar  Neuron Neuron is the structural and functional unit of nervous system . It receives, processes and transmits nerve impulses. Neurons are also called nerve cells . Parts of a Neuron 1. Cell Body (Cyton / Soma) Main part of neuron containing the cytoplasm and nucleus . Controls all activities of the neuron. Contains Nissl’s granules . Nissl’s Granules Granular structures present in cytoplasm. Help in protein synthesis . Present in cell body and dendrites. Absent in axon. 2. Dendrites Short, branched fibres arising from cell body. Receive stimuli or nerve impulses. Carry impulses towards the cell body . Important Point Dendrites contain Nissl’s granules . 3. Axon Long fibre arising from cell body. Conducts nerve impulses away from the cell body . Distal end of axon is branched. Axon Terminal Terminal branches end in swollen bulb-like structures called synaptic knobs . Synapt...

  NEET-Level MCQs (Hard) Chapter: Neural Control and Coordination  By- Dr.Sanjaykumar pawar 1. Homeostasis is best defined as: A. Coordination between muscles and bones B. Maintenance of constant internal environment C. Production of hormones by glands D. Transmission of impulses through neurons ✅ Answer: B Explanation: Homeostasis means maintaining stable internal body conditions like temperature, pH, oxygen level, etc. 2. Which of the following systems provides point-to-point rapid coordination? A. Endocrine system B. Circulatory system C. Neural system D. Excretory system ✅ Answer: C Explanation: Neural system uses electrical impulses for fast and precise communication. 3. During physical exercise, increased oxygen demand directly causes: A. Decrease in heartbeat B. Reduced respiration rate C. Increase in respiration rate D. Kidney failure ✅ Answer: C Explanation: More oxygen is needed during exercise, so breathing rate increases. 4. Which s...