NEET · Biology doubts
247 doubts found
What does “Cell membrane” actually mean in Cell: The Unit of Life, and why does it matter for NEET?
a selectively permeable boundary described by the fluid-mosaic model.
What does “Nucleic acids” actually mean in Biomolecules, and why does it matter for NEET?
DNA and RNA, the molecules that store and carry genetic information.
What is the difference between mitosis and meiosis?
Mitosis gives 2 identical diploid cells (growth/repair); meiosis gives 4 varied haploid cells (gametes).
What is the difference between photosynthesis and respiration?
Photosynthesis stores energy by making glucose and releasing O₂; respiration releases that energy by breaking glucose and using O₂.
What is the difference between aerobic respiration and anaerobic respiration?
Aerobic respiration uses oxygen and yields ~36–38 ATP per glucose; anaerobic (fermentation) needs no oxygen and yields only ~2 ATP.
What is the difference between villi and microvilli?
Villi are finger-like folds of the intestinal wall; microvilli are much smaller projections on each villus cell — together they maximise absorption area.
What is the difference between breathing and cellular respiration?
Breathing is the physical movement of air in and out; cellular respiration is the chemical release of energy from glucose inside cells.
What is the difference between systole and diastole?
Systole is heart-muscle contraction (pumping blood out); diastole is relaxation (chambers refill).
What is the difference between ultrafiltration and reabsorption?
Ultrafiltration pushes water and small solutes out of the blood in the glomerulus; reabsorption takes back the useful ones in the tubule.
What is the difference between resting potential and action potential?
Resting potential is the neuron's charged 'ready' state (about −70 mV); an action potential is the brief reversal that carries the impulse.
What is the difference between endocrine gland and exocrine gland?
Endocrine glands are ductless and release hormones into the blood; exocrine glands (sweat, salivary) release secretions through ducts.
What is the difference between genotype and phenotype?
Genotype is the genetic makeup (e.g. Tt); phenotype is the visible trait it produces (e.g. tall).
What is the difference between codon and anticodon?
A codon is a triplet of bases on mRNA that codes for an amino acid; an anticodon is the complementary triplet on tRNA that reads that codon.
What is the difference between divergent evolution and convergent evolution?
Divergent evolution makes related species differ (homologous organs); convergent evolution makes unrelated species resemble each other (analogous organs).
What is the difference between innate immunity and acquired immunity?
Innate immunity is fast and non-specific (skin, phagocytes); acquired immunity is slower, specific, and has memory (antibodies).
What is the difference between spermatogenesis and oogenesis?
Spermatogenesis produces four equal functional sperm; oogenesis produces one large ovum and small polar bodies.
What is the difference between PCR and gel electrophoresis?
PCR amplifies a DNA segment into many copies; gel electrophoresis separates DNA fragments by size using an electric field.
What is the difference between food chain and food web?
A food chain is a single linear feeding sequence; a food web is many interconnected chains showing all feeding relationships.
I keep getting “Cell membrane” questions wrong in Cell: The Unit of Life. What's the trap?
thinking the membrane lets everything pass freely.
I keep getting “Nucleic acids” questions wrong in Biomolecules. What's the trap?
thinking RNA cannot store genetic information (some viruses use RNA).
What is the difference between haploid and diploid?
Haploid (n) cells have one set of chromosomes (gametes); diploid (2n) cells have two sets (body cells).
How is Photosynthesis in Higher Plants tested in NEET, and what should I focus on?
Prioritise the core ideas: Light reactions, Calvin cycle (dark reaction), Chlorophyll.
What is the difference between glycolysis and Krebs cycle?
Glycolysis splits glucose to pyruvate in the cytoplasm (no O₂ needed); the Krebs cycle oxidises it fully in the mitochondria (aerobic).
What is the difference between pepsin and trypsin?
Pepsin digests protein in the acidic stomach; trypsin digests protein in the alkaline small intestine.