MDCAT Online Entry Test Preparation - MIMS

30 Important MCQs on Immunity for MDCAT 2026 Innate Immunity Which of the following is the first line of defense in the human body? A) Antibodies B) Skin C) T lymphocytes D) Plasma cells Answer: B) Skin The immunity present at birth is called: A) Acquired immunity B) Passive immunity C) Innate immunity D) Artificial immunity Answer: C) Innate immunity Which cells engulf and destroy pathogens? A) RBCs B) Neurons C) Phagocytes D) Platelets Answer: C) Phagocytes Fever during infection is mainly caused by: A) Antibodies B) Pyrogens C) Histamine D) Hemoglobin Answer: B) Pyrogens Inflammation is characterized by all EXCEPT: A) Redness B) Swelling C) Pain D) Low blood supply Answer: D) Low blood supply Adaptive Immunity Immunity developed after exposure to pathogens is called: A) Innate immunity B) Acquired immunity C) Genetic immunity D) Natural immunity Answer: B) Acquired immunity Antibodies are produced by: A) T cells B) Plasma cells C) Macrophages D) Mast cells Answer: B) Plasma c...

  HUMAN HEART MCQs 1. The human heart is enclosed in: A) Pleura B) Pericardium C) Peritoneum D) Meninges Answer: B) Pericardium 2. The septum separates: A) Arteries and veins B) Atria and ventricles C) Right and left sides of heart D) Valves and chambers Answer: C) Right and left sides of heart 3. Tricuspid valve is present between: A) Left atrium & left ventricle B) Right atrium & right ventricle C) Left ventricle & aorta D) Right ventricle & pulmonary artery Answer: B) Right atrium & right ventricle 4. Which part prevents backflow of blood into left ventricle? A) Tricuspid valve B) Bicuspid valve C) Aortic semilunar valve D) Pulmonary valve Answer: C) Aortic semilunar valve 5. The right ventricle pumps blood to: A) Body B) Lungs C) Liver D) Kidneys Answer: B) Lungs CARDIAC CYCLE & HEARTBEAT MCQs 6. Duration of one cardiac cycle in a normal human is: A) 0.5 sec B) 0.8 sec C) 1.2 sec D) 2 sec Answer: B) 0.8 sec 7. The “lub” sound is produced by closure...

MDCAT Important MCQs (Inheritance) Mendel’s Laws 1. Mendel’s law of segregation states that: A) Genes blend B) Alleles separate during gamete formation C) Genes mutate D) Traits are linked Answer: B 2. Law of independent assortment is valid when genes are: A) Linked B) On same chromosome C) On different chromosomes D) Dominant Answer: C 3. The genotypic ratio of a monohybrid cross (F₂) is: A) 3:1 B) 1:2:1 C) 9:3:3:1 D) 2:1 Answer: B 4. Test cross is used to determine: A) Phenotype B) Genotype C) Mutation D) Linkage Answer: B 5. A dihybrid cross produces how many gamete types? A) 2 B) 4 C) 8 D) 16 Answer: B 6. Back cross is a cross between: A) F₁ × recessive parent B) F₁ × dominant parent C) F₁ × F₁ D) Parent × parent Answer: A 7. Phenotypic ratio 9:3:3:1 indicates: A) Linkage B) Independent assortment C) Mutation D) Codominance Answer: B Gene Linkage & Crossing Over 8. Linked genes are located on: A) Different chromosomes B) Same chromosome C) Ribosomes D) Cytoplasm Answer: ...

  🧠 Nervous System MCQs 1. The basic functional unit of the nervous system is: A) Axon B) Dendrite C) Neuron D) Synapse ✅ Answer: C) Neuron 2. Which part of the neuron receives impulses? A) Axon B) Dendrites C) Node of Ranvier D) Myelin sheath ✅ Answer: B) Dendrites 3. The gap between two neurons is called: A) Node B) Synapse C) Axon terminal D) Receptor ✅ Answer: B) Synapse 4. Which neurotransmitter is involved in muscle contraction? A) Dopamine B) Serotonin C) Acetylcholine D) Adrenaline ✅ Answer: C) Acetylcholine 5. The part of brain responsible for balance is: A) Cerebrum B) Medulla C) Cerebellum D) Hypothalamus ✅ Answer: C) Cerebellum ⚡ Reflex Action MCQs 6. Reflex actions are controlled by: A) Brain B) Spinal cord C) Cerebellum D) Hypothalamus ✅ Answer: B) Spinal cord 7. The pathway of reflex action is called: A) Reflex arc B) Neural pathway C) Motor path D) Sensory arc ✅ Answer: A) Reflex arc 🧬 Endocrine System MCQs 8. The “master gland” is: A) Thyroid B) Pituitary C) Adre...

MCQs 1. Acellular life forms are characterized by: A. Presence of nucleus B. Absence of cellular organization C. Ability to reproduce independently D. Presence of cytoplasm Answer: B 2. Viruses are considered non-living because they: A. Contain DNA or RNA B. Can mutate C. Lack metabolic machinery D. Have protein coat Answer: C 3. The protein coat of a virus is called: A. Envelope B. Capsid C. Nucleoid D. Plasma membrane Answer: B 4. Which of the following contains only RNA and no protein coat? A. Virus B. Bacteria C. Viroid D. Prion Answer: C 5. Prions are made up of: A. DNA only B. RNA only C. Protein only D. Lipids Answer: C 6. Which of the following diseases is caused by prions? A. AIDS B. Tuberculosis C. Mad cow disease D. Influenza Answer: C 7. Viruses replicate only inside: A. Soil B. Water C. Host cell D. Air Answer: C 8. The genetic material in viruses can be: A. Only DNA B. Only RNA C. Both DNA and RNA (but not together) D. Neither DNA nor RNA Answer: C 9. Which struct...

1. Enzymes are: A. Carbohydrates B. Lipids C. Proteins D. Vitamins Answer: C. Proteins 2. The region of enzyme where substrate binds is called: A. Active site B. Binding site C. Reaction site D. Catalytic center Answer: A. Active site 3. Enzymes speed up reactions by: A. Increasing activation energy B. Decreasing activation energy C. Increasing temperature D. Changing equilibrium Answer: B. Decreasing activation energy 4. Which model explains enzyme action? A. Fluid mosaic model B. Lock and key model C. Bohr model D. Sandwich model Answer: B. Lock and key model 5. Enzymes are specific due to: A. Shape of active site B. Temperature C. pH D. Concentration Answer: A. Shape of active site 6. A non-protein part of enzyme is called: A. Apoenzyme B. Cofactor C. Substrate D. Product Answer: B. Cofactor 7. Enzyme + Cofactor = A. Apoenzyme B. Holoenzyme C. Substrate D. Product Answer: B. Holoenzyme 8. Optimum temperature for most human enzymes is: A. 25°C B. 37°C C. 50°C D. 100°C Answer: ...

  1. Bioenergetics is the study of: A. Energy flow in living organisms B. Cell division C. DNA replication D. Protein synthesis Answer: A. Energy flow in living organisms 2. The main energy currency of the cell is: A. ADP B. ATP C. NADH D. FADH₂ Answer: B. ATP 3. The breakdown of glucose to release energy is called: A. Photosynthesis B. Respiration C. Fermentation D. Transpiration Answer: B. Respiration 4. The first step of cellular respiration is: A. Krebs cycle B. Electron transport chain C. Glycolysis D. Oxidative phosphorylation Answer: C. Glycolysis 5. Glycolysis occurs in the: A. Mitochondrial matrix B. Cytoplasm C. Nucleus D. Ribosome Answer: B. Cytoplasm 6. Total ATP produced from one glucose molecule in aerobic respiration is approximately: A. 2 ATP B. 4 ATP C. 36–38 ATP D. 100 ATP Answer: C. 36–38 ATP 7. The Krebs cycle occurs in the: A. Cytoplasm B. Mitochondrial matrix C. Inner mitochondrial membrane D. Nucleus Answer: B. Mitochondrial matrix...