Most Repeated MDCAT Biology MCQs — Past Papers with Answers

What MDCAT Biology actually repeats

The chapters that come most often are Transport, Coordination, Bio-molecules, Nutrition, Genetics and Bioenergetics. The paper is a matching exam: which cell makes pepsin, which vessel carries oxygen, which hormone rises before ovulation. Practise those chapters twice.

Times on a miss is how often that idea usually comes, not a count of the same sentence. A glucose question and a glycogen question are two different sentences for the same Bio-molecules topic.

MDCAT Biology past-paper chapter list

Each line is a live quiz. Large chapters (Bio-molecules, Nutrition, Transport, Coordination, Support, Genetics) split into two short quizzes.

• B1 · Bio Molecules — 33 most-repeated MCQs · 2 short quizzes. Often asked: Monosaccharides, Disaccharide identity, Polysaccharide function, Glycosidic bond.
• B2 · Cell Structure and Function — 32 most-repeated MCQs · 2 short quizzes. Often asked: Nucleolus, Mitochondrial cristae, Chloroplast thylakoid, RER.
• B3 · Enzymes — 14 most-repeated MCQs. Often asked: Catalyst definition, Activation energy, Active site, Lock and key vs induced fit.
• B4 · Cell Division — 16 most-repeated MCQs. Often asked: Cell cycle phases, Mitosis purpose, Prophase mitosis, Metaphase.
• B5 · Biodiversity / Acellular life / Kingdoms — 26 most-repeated MCQs · 2 short quizzes. Often asked: Virus structure, Virus replication, HIV receptor, AIDS as STD.
• B6 · Life Processes — Nutrition — 39 most-repeated MCQs · 2 short quizzes. Often asked: Autotroph vs heterotroph, Human dentition idea, Salivary amylase, Chief cells.
• B7 · Bioenergetics — 20 most-repeated MCQs. Often asked: Glycolysis location, Glycolysis net ATP, Link reaction, Krebs location.
• B8 · Transport — 43 most-repeated MCQs · 3 short quizzes. Often asked: Heart chambers, SA node, AV node delay, Valves.
• B9 · Homeostasis — 13 most-repeated MCQs. Often asked: Nephron unit, Glomerular filtration, What is filtered, PCT reabsorption.
• B10 · Gaseous Exchange — 13 most-repeated MCQs. Often asked: Airway path, Alveolus structure, Inspiration, Expiration rest.
• B11 · Coordination and Control — 37 most-repeated MCQs · 2 short quizzes. Often asked: Neuron parts, Myelin, RMP, Action potential.
• B12 · Support and Movement — 34 most-repeated MCQs · 2 short quizzes. Often asked: Bone vs cartilage, Cartilage healing, Joint types, Ligament vs tendon.
• B13 · Reproduction — 25 most-repeated MCQs · 2 short quizzes. Often asked: Spermatogenesis site, Epididymis, Testosterone source, Oogenesis timing.
• B14 · Genetics — 38 most-repeated MCQs · 2 short quizzes. Often asked: Gene vs allele, Homo vs hetero, Dominant vs recessive, Monohybrid 3:1.
• B15 · Biotechnology — 21 most-repeated MCQs · 2 short quizzes. Often asked: Restriction enzyme, Ligase in cloning, Plasmid vector, PCR steps.
• B16 · Evolution — 12 most-repeated MCQs. Often asked: Darwin selection, Lamarck contrast, Homology, Analogy.

How to use the Biology questions

1. Start with Bio-molecules and Enzymes — they help Nutrition and Bioenergetics.
2. Do Transport and Coordination as full quizzes. They take the most marks.
3. Genetics and Biotechnology later in the week, then Evolution as a short set.
4. After a miss, read the why. The neighbouring option is usually the trap.