NEET · Biology doubts
247 doubts found
What is the difference between rough ER and smooth ER?
Rough ER is studded with ribosomes and makes proteins; smooth ER lacks ribosomes and makes lipids.
What is the difference between saturated fat and unsaturated fat?
Saturated fats have no C=C double bonds and are usually solid; unsaturated fats have double bonds and are usually liquid oils.
What are the most common mistakes students make in Cell Cycle & Cell Division?
DNA replication happens in the S phase of interphase, before mitosis — not during it.
What are the most common mistakes students make in Respiration in Plants?
glycolysis is anaerobic and occurs in the cytoplasm; oxygen is only needed for the later mitochondrial stages.
What are the most common mistakes students make in Digestion & Absorption?
bile is an emulsifier that breaks fat into droplets; it contains no digestive enzymes.
What are the most common mistakes students make in Breathing & Exchange of Gases?
breathing is the physical exchange of air; cellular respiration is the biochemical release of energy in cells — they are different.
What are the most common mistakes students make in Excretory Products & Elimination?
roughly 99% of the glomerular filtrate is reabsorbed; only about 1% is excreted as urine.
What are the most common mistakes students make in Chemical Coordination (Endocrine System)?
insulin LOWERS blood glucose; it is glucagon that raises it.
What are the most common mistakes students make in Principles of Inheritance & Variation?
3:1 is the PHENOTYPE ratio of a monohybrid cross; the genotype ratio is 1:2:1.
What are the most common mistakes students make in Molecular Basis of Inheritance?
replication is semi-conservative — each daughter molecule retains one parental strand.
What are the most common mistakes students make in Human Health & Disease?
antibiotics act only on bacteria; they are useless against viruses like the common cold, and overuse causes resistance.
How do I revise Human Reproduction & Reproductive Health quickly before the exam?
One-page summary of Gametogenesis, Menstrual cycle, Fertilisation, then timed previous-year questions.
What are the most common mistakes students make in Biotechnology & its Applications?
they recognise specific palindromic sequences and cut only at those exact sites.
What are the most common mistakes students make in Ecosystem & Ecology?
nutrients are recycled, but energy flows one-way and is steadily lost as heat — hence the 10% law.
How is Cell: The Unit of Life tested in NEET, and what should I focus on?
Prioritise the core ideas: Cell theory, Prokaryotic cell, Mitochondria.
How is Biomolecules tested in NEET, and what should I focus on?
Prioritise the core ideas: Enzymes, Enzyme specificity, Proteins.
How do I revise Cell Cycle & Cell Division quickly before the exam?
One-page summary of Phases of the cell cycle, Mitosis, Meiosis, then timed previous-year questions.
How do I revise Respiration in Plants quickly before the exam?
One-page summary of Glycolysis, Aerobic respiration, Fermentation, then timed previous-year questions.
How do I revise Digestion & Absorption quickly before the exam?
One-page summary of Digestive enzymes, Absorption, Bile, then timed previous-year questions.
How do I revise Breathing & Exchange of Gases quickly before the exam?
One-page summary of Gas exchange, Oxygen transport, Carbon dioxide transport, then timed previous-year questions.
How do I revise Excretory Products & Elimination quickly before the exam?
One-page summary of Nephron, Urine formation, Nitrogenous waste, then timed previous-year questions.
How do I revise Chemical Coordination (Endocrine System) quickly before the exam?
One-page summary of Hormones, Insulin and glucagon, Thyroxine, then timed previous-year questions.
How do I revise Principles of Inheritance & Variation quickly before the exam?
One-page summary of Mendel's laws, Monohybrid ratio, Incomplete dominance, then timed previous-year questions.
How do I revise Molecular Basis of Inheritance quickly before the exam?
One-page summary of DNA structure, Semi-conservative replication, Transcription, then timed previous-year questions.