
General Science (Biochemistry & Human Physiology Section) | Target Exams: SSC CGL, CHSL, CPO, RRB NTPC, Group D, State PSCs & Police Exams
General Science Biology me Nutrition and Vitamins (पोषण एवं विटामिन) ek aisi high-yielding category hai jahan se examiners har saal direct factual aur matching questions poochte hain. Carbohydrates, Proteins aur Fats jahan sharir ko energy aur structural growth dete hain, wahin Vitamins aur Minerals essential micronutrients hain jo metabolic pathways ko regulate karte hain. Casimir Funk dwara ‘Vitamine’ term coin karne se lekar Fat-soluble (A, D, E, K) aur Water-soluble (B-Complex, C) vitamins ke scientific chemical names, unke dietary sources aur deficiency diseases (jaise Scurvy, Rickets, Beriberi, Pellagra, Pernicious Anemia)—is master revision guide me sabhi vital concepts ko structured format me compile kiya gaya hai.
1. Nutrition & Vitamins Core: Classification, Chemical Names & Diseases
A. Macronutrients vs Micronutrients Energy Values
- Carbohydrates: Primary energy source. Caloric yield: $4.0\ \text{kcal/gram}$. Basic monomer: Glucose.
- Proteins: Body building and tissue repair blocks. Caloric yield: $4.0\ \text{kcal/gram}$. Basic monomer: Amino acids (peptide bonds).
- Fats / Lipids: Concentrated energy storage. Maximum caloric yield: $9.0\ \text{kcal/gram}$. Glycerol + Fatty acids.
- Vitamins & Minerals: Protective regulatory nutrients. Caloric yield: $0\ \text{kcal/gram}$.
B. Master Table of Fat-Soluble Vitamins (A, D, E, K)
| Vitamin | Chemical / Scientific Name | Primary Biological Function | Deficiency Disease (कमी से होने वाले रोग) |
|---|---|---|---|
| Vitamin A | Retinol | Rhodopsin pigment synthesis in retina, epithelial integrity | Nyctalopia (Night Blindness), Xerophthalmia (dry cornea), Keratomalacia |
| Vitamin D | Calciferol (D2: Ergocalciferol, D3: Cholecalciferol) | Hormone-like action; Calcium and Phosphorus intestinal absorption | Rickets (children – bow legs/pigeon chest), Osteomalacia (adults – soft fragile bones) |
| Vitamin E | Tocopherol | Potent antioxidant (“Beauty Vitamin”), cellular membrane protection | Sterility / Infertility, muscular dystrophy, hemolytic anemia in infants |
| Vitamin K | Phylloquinone (K1) / Menaquinone (K2) | Liver synthesis of blood clotting factors (Prothrombin, Factors VII, IX, X) | Defective blood coagulation, prolonged bleeding time, Hemorrhage |
C. Master Table of Water-Soluble Vitamins (B-Complex & C)
| Vitamin | Chemical Name | Key Coenzyme / Role | Major Deficiency Condition |
|---|---|---|---|
| Vitamin B1 | Thiamine | TPP (Carbohydrate pyruvate metabolism) | Beriberi (Wet: heart failure; Dry: nerve paralysis), Wernicke-Korsakoff syndrome |
| Vitamin B2 | Riboflavin (Yellow enzyme) | FAD / FMN coenzymes | Cheilosis (cracked lip corners), Glossitis (magenta red tongue), Angular stomatitis |
| Vitamin B3 | Niacin (Nicotinic acid) | NAD / NADP coenzymes | Pellagra (4D disease: Dermatitis, Diarrhea, Dementia, Death) |
| Vitamin B5 | Pantothenic Acid | Coenzyme A (CoA) constituent | Burning feet syndrome (Gopalan’s syndrome), fatigue, paresthesia |
| Vitamin B6 | Pyridoxine | Amino acid transamination, neurotransmitter synthesis | Convulsions in infants, peripheral neuropathy, microcytic anemia |
| Vitamin B7 | Biotin (formerly Vitamin H) | Carboxylation reactions | Alopecia (Hair loss), dermatitis, muscle pain (caused by raw egg avidin) |
| Vitamin B9 | Folic Acid (Folacin) | DNA synthesis, RBC maturation, neural tube development | Megaloblastic / Macrocytic Anemia, Spina bifida (Neural tube defect in fetuses) |
| Vitamin B12 | Cyanocobalamin (Contains Cobalt metal) | Myelin sheath synthesis, erythrocyte maturation | Pernicious Anemia (destruction of gastric parietal cells/lack of Intrinsic factor) |
| Vitamin C | Ascorbic Acid (Heat-labile) | Collagen protein synthesis, iron absorption, antioxidant | Scurvy (bleeding spongy gums, delayed wound healing, petechiae) |
D. Essential Minerals & Trace Elements
- Iron ($Fe$): Hemoglobin aur Myoglobin ka core constituent. Deficiency causes Microcytic Hypochromic Anemia.
- Iodine ($I$): Thyroid hormone (Thyroxine – $T_4$ and $T_3$) synthesis ke liye mandatory. Deficiency causes Simple Goitre (galgand) aur bachhon me Cretinism.
- Calcium ($Ca$): Bone and teeth mineralisation, blood coagulation cascade (Factor IV), muscle contraction, and nerve impulse transmission.
- Phosphorus ($P$): Bone matrix, ATP energy currency, phospholipids, and nucleic acid backbone.
2. Exam Weightage & Trends Table
| Competitive Exam | Average Questions | Core High-Yield Focus Areas |
|---|---|---|
| SSC CGL / CHSL (Tier 1 & Tier 2) | 2 – 3 Questions | Scientific chemical names (Calciferol, Tocopherol, Pyridoxine), Vitamin B12 cobalt content, Pellagra (Niacin), Scurvy, Salk vs Sabin. |
| RRB NTPC / Group D / ALP | 2 – 4 Questions | Fat vs water-soluble classification, Night blindness (Vitamin A), Sunshine vitamin (D), Citrus fruits (Vitamin C), Rickets vs Osteomalacia. |
| State PSCs (BPSC, UPPSC, MPPSC) | 3 – 4 Questions | Pernicious anemia and Castle’s intrinsic factor, Avidin antagonism with Biotin, Golden Rice beta-carotene, Kwashiorkor vs Marasmus. |
| Defense & Police (NDA, CDS, Police SI) | 2 – 3 Questions | Caloric values per gram, Blood clotting factors dependence on Vitamin K, Goitre iodine relation, Xerophthalmia stages. |
📥 Download Nutrition and Vitamins Complete Study Notes PDF
High-yield vitamin summary tables, chemical nomenclature cheat sheets, deficiency symptom guides, and all 50 practice questions with complete solutions compiled in one single offline revision PDF.
4. Recommended General Science Preparation Books
5. Frequently Asked Questions (FAQs)
Q1: What is the main difference between fat-soluble and water-soluble vitamins?
Ans: Fat-soluble vitamins (A, D, E, K) dissolve in organic lipids, require dietary bile salts for absorption, and are stored in the liver and adipose tissues. Excessive intake can cause toxicity (hypervitaminosis). Water-soluble vitamins (B-Complex and C) dissolve in water, cannot be stored in large quantities in the body (except B12), and excess amounts are readily excreted through urine, requiring regular daily dietary replenishment.
Q2: Why does the consumption of raw egg whites cause Biotin (Vitamin B7) deficiency?
Ans: Raw egg whites contain a specific glycoprotein called Avidin. Avidin binds with extreme affinity to dietary Biotin (Vitamin B7/H) in the gastrointestinal tract, forming an insoluble complex that cannot be absorbed into the bloodstream. Cooking or boiling eggs denatures Avidin, rendering it harmless.
Q3: What causes Pernicious Anemia and how is it related to the stomach?
Ans: Pernicious Anemia is an autoimmune disorder where the immune system destroys the gastric parietal (oxyntic) cells of the stomach mucosa. These cells produce Castle’s Intrinsic Factor, which is mandatory for the absorption of Vitamin B12 (Cyanocobalamin) in the terminal ileum. Without intrinsic factor, B12 cannot be absorbed, leading to defective erythropoiesis and severe macrocytic anemia.
Q4: Why is Vitamin D considered both a vitamin and a steroid hormone?
Ans: Unlike other vitamins, Vitamin D (Cholecalciferol) can be synthesized endogenously in human skin from 7-dehydrocholesterol upon exposure to sunlight (UVB rays). It is then hydroxylated by the liver and kidneys into its active hormonal form, Calcitriol ($1,25\text{-(OH)}_2D_3$), which binds to specific nuclear Vitamin D Receptors (VDR) to regulate gene transcription and blood calcium homeostasis like a classic steroid hormone.
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