NEET doubts
700 doubts found
What does “Independent assortment” actually mean in Principles of Inheritance and Variation, and why does it matter for NEET?
alleles of different genes assort independently into gametes, giving the 9:3:3:1 dihybrid ratio.
What does “Genetic code” actually mean in Molecular Basis of Inheritance, and why does it matter for NEET?
a triplet, degenerate, non-overlapping and near-universal code with AUG as start and three stop codons.
I keep getting “Hardy-Weinberg principle” questions wrong in Evolution. What's the trap?
thinking the equation means evolution has stopped everywhere.
I keep getting “Blood clotting” questions wrong in Body Fluids and Circulation. What's the trap?
thinking red blood cells cause clotting.
What is the difference between nervous coordination and hormonal coordination?
Nervous control is fast, brief and point-to-point through electrical impulses; hormonal control is slower, longer-lasting and spread through the blood to many target organs.
I keep getting “Population interactions” questions wrong in Ecosystem. What's the trap?
mixing up commensalism and mutualism.
I keep getting “PCR” questions wrong in Biotechnology - Principles and Processes. What's the trap?
thinking PCR needs living cells to copy DNA.
I keep getting “Antibody structure” questions wrong in Human Health and Disease. What's the trap?
thinking an antibody is a single polypeptide chain.
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.