Скачать или смотреть Biochemistry | Polysaccharides and Lipids | CSIR NET - GATE - IIT JAM - CUET -SET Life Science| IFAS

This video is a detailed lecture on Biochemistry, specifically focusing on Polysaccharides and Lipids, presented by IFAS Lifescience for students preparing for exams like CSIR NET JRF, GATE, IIT JAM, CUET and DBT. IFAS: India's No. 1 Institute for CSIR NET, GATE, SET, DBT, BARC, ICMR & other PhD Life Science Entrance Examinations!

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Detailed Time Stamps & Summary
I. Polysaccharides [00:14]
[00:26] Definition of polysaccharides as many sugars linked by glycosidic linkages.
[02:20] Homo-polysaccharides: Composed of a single type of sugar (e.g., starch, glycogen, cellulose, chitin).
[03:50] Hetero-polysaccharides: Yield two or more types of monosaccharides upon hydrolysis (e.g., heparin, chondroitin).
[05:37] Functional classification: Storage (energy) vs. Structural (cell walls).

II. Storage Polysaccharides [07:05]
[07:45] Starch: The preferred energy storage in plants.
Amylose: Linear polymer with α 1-4 linkages [09:27].
Amylopectin: Branched structure with α 1-4 and α 1-6 linkages [10:07].
[14:18] Glycogen: Energy storage in animals (liver and muscles). Highly branched compared to starch.
[18:13] Inulin: Polymer of fructose used to assess Glomerular Filtration Rate (GFR) in kidneys [20:06].

III. Structural Polysaccharides [21:35]
[21:52] Cellulose: Most abundant biomolecule; β 1-4 linkages make it indigestible for most animals without symbiotic microbes [25:51].
[30:49] Chitin: Polymer of N-acetyl-D-glucosamine; found in insect exoskeletons and fungal cell walls.
[35:26] Pectin: Component of the middle lamella in plants; important in fruit ripening (degraded by polygalacturonase) [39:53].

IV. Lipids & Fatty Acids [56:07]
[57:27] Definition of lipids based on solubility (low in water, high in non-polar solvents).
[01:02:44] Why lipids are preferred for energy storage: yield more energy (9 kcal/g) and occupy less space (hydrophobic).
[01:08:03] Fatty Acids: Long aliphatic chains with a carboxyl group.
Saturated: No double bonds; melting point increases with chain length [01:13:53].
Unsaturated: Contain double bonds (mostly cis orientation, which introduces "kinks") [01:18:41].
[01:24:54] Essential Fatty Acids: Polyunsaturated fatty acids (PUFAs) like Omega-3 and Omega-6 that animals cannot synthesize.

V. Lipid Signaling & Membrane Lipids [01:30:09]
[01:31:27] Eicosanoids: Derived from Arachidonic acid; includes prostaglandins (inflammation/pain) and thromboxanes (blood clotting) [01:32:12].
[01:39:02] Soaps & Detergents: Amphipathic molecules that form micelles to remove stains [01:40:04].
[01:48:40] Membrane Lipids: Phospholipids, glycolipids, and sphingolipids.
[01:58:20] Phosphatidylcholine (Lecithin): Acts as a lung surfactant (DPPC) [01:59:18].
[02:04:19] Phosphatidylinositol (PIP2): Precursor for secondary messengers like IP3 and DAG [02:05:11].
[02:07:38] Cardiolipin: Unique to the inner mitochondrial membrane.

VI. Sphingolipids & Clinical Disorders [02:15:20]
[02:17:43] Sphingomyelin: Found in high amounts in the myelin sheath.
[02:22:25] Glycosphingolipids: Cerebrosides and Gangliosides (receptors for toxins and viruses) [02:24:27].
[02:25:15] Lipid Storage Diseases: Brief mention of Niemann-Pick, Gaucher, and Tay-Sachs diseases.