IB Biology Study Guides, Exam Tips &…

IB Biology · Dec 7, 2025 · 6

IB Biology: DNA Profiling to Compare Individuals

IB Biology guide to DNA profiling: learn how STRs, PCR, and gel electrophoresis compare individuals, plus exam tips and RevisionDojo resources.

IB Biology · Dec 7, 2025 · 6

IB Biology: Mendel’s Laws and Inheritance Patterns

IB Biology students: learn how Mendel’s Laws explain inheritance patterns, Punnett squares, and meiosis links--with exam-focused tips and practice.

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IB Biology · Dec 7, 2025 · 6

IB Biology: DNA Profiling to Compare Individuals

IB Biology guide to DNA profiling: learn how STRs, PCR, and gel electrophoresis compare individuals, plus exam tips and RevisionDojo resources.

IB Biology · Dec 7, 2025 · 6

IB Biology: Mendel’s Laws and Inheritance Patterns

IB Biology students: learn how Mendel’s Laws explain inheritance patterns, Punnett squares, and meiosis links--with exam-focused tips and practice.

Design Technology (First Exam 2027)

Environmental systems and societies (ESS)

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Psychology (First Exam 2027)
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Theory of Knowledge (TOK)

Arabic A
Arabic A Lit
Arabic ab initio
Arabic B
Biology
Business Management
Chemistry
Chinese A Lang & Lit
Chinese B
Computer Science (CS)
Computer Science (First Exam 2027)

Design Technology (DT)
Design Technology (First Exam 2027)
Digital Society (DS)
Economics
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English A Lit
English B
Environmental systems and societies (ESS)
French A
French A Lit
French ab initio

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Geography
German A
German A Lit
German ab initio
German B
Global Politics
History
Mathematics Analysis and Approaches (AA)
Mathematics Applications & Interpretation (AI)
Philosophy

Physics
Psychology
Psychology (First Exam 2027)
Spanish A
Spanish A Lit
Spanish ab initio
Spanish B
Sports, exercise and health science (SEHS)
Theory of Knowledge (TOK)

IB Biology · Dec 1, 2025 · 6 min read

IB Biology: Gene Expression and Cell Specialization

IB Biology guide to how gene expression creates cell specialization, from transcription factors to epigenetics, with an exam-focused checklist and FAQs.

IB Biology · Dec 1, 2025 · 6 min read

IB Biology: Why Eukaryotes Need Compartmentalization

IB Biology guide to why eukaryotes need compartmentalization: organelles boost efficiency, prevent interference, and improve gene control for exams.

IB Biology · Dec 1, 2025 · 5 min read

IB Biology: SA:V Ratio and Gas Exchange Efficiency

IB Biology guide to how surface area-to-volume ratio boosts gas exchange efficiency, with exam-ready explanations, links, and quick revision tips.

IB Biology · Dec 1, 2025 · 5 min read

IB Biology: Niche Differentiation Reduces Competition

IB Biology students: learn how niche differentiation reduces competition in ecosystems, with clear examples, exam tips, and RevisionDojo resources.

IB Biology · Dec 1, 2025 · 6 min read

IB Biology: Endosymbiosis Evidence in Organelles

IB Biology guide to endosymbiosis evidence: how mitochondria and chloroplasts reveal their bacterial origins through DNA, ribosomes and membranes.

IB Biology · Dec 1, 2025 · 5 min read

IB Biology: How Chloroplasts Optimize Light Absorption

IB Biology guide to how chloroplast structures optimize light absorption: thylakoids, grana, pigments, proton gradients, and exam-ready tips.

IB Biology · Dec 1, 2025 · 6 min read

IB Biology: Fatty Acids and Membrane Fluidity

IB Biology guide to how fatty acid structure controls membrane fluidity--saturated vs unsaturated tails, cholesterol buffering, and exam tips.

IB Biology · Dec 1, 2025 · 6 min read

IB Biology: Why DNA Replication Comes Before Division

IB Biology explainer on why DNA replication must happen before cell division--genetic continuity, sister chromatids, checkpoints, and exam tips.

IB Biology · Dec 1, 2025 · 6 min read

IB Biology: Why ATP Powers Muscle Contraction and Relaxation

IB Biology guide to why ATP is essential for muscle contraction and relaxation, from cross-bridge cycling to calcium pumps and rigor mortis.

IB Biology · Dec 1, 2025 · 5 min read

IB Biology: NADH and FADH2 in Energy Transfer

IB Biology guide to how NADH and FADH2 transfer energy in respiration, power the electron transport chain, and drive ATP synthesis for exams.

IB Biology · Dec 1, 2025 · 6 min read

IB Biology: Feedback Inhibition in Metabolic Pathways

IB Biology guide to why metabolic pathways use feedback inhibition: save energy, maintain homeostasis, and balance pathway flux for exams.

IB Biology · Dec 1, 2025 · 5 min read

IB Biology: Actin and Myosin in Muscle Contraction

IB Biology guide to how actin and myosin interact to cause muscle contraction, with calcium, ATP, and sliding filament steps explained fast.

IB Biology · Dec 1, 2025 · 6 min read

IB Biology: Fundamental vs Realized Niche Explained

IB Biology guide to fundamental vs realized niche: learn what determines each niche, with exam-ready examples of competition, predation, and mutualism.

IB Biology · Dec 1, 2025 · 6 min read

IB Biology: Ligand--Receptor Signalling Cascades

IB Biology guide to ligand--receptor interactions and intracellular signalling cascades, covering GPCRs, RTKs, second messengers, and exam tips.

IB Biology · Dec 1, 2025 · 6 min read

IB Biology: How Chromosomes Prevent DNA Damage

IB Biology guide to how chromosome structure prevents DNA damage: histones, chromatin states, telomeres, centromeres, and nuclear organization.

IB Biology · Dec 1, 2025 · 6 min read

IB Biology: Morphological vs Physiological Adaptations

IB Biology guide to morphological and physiological adaptations, with exam-ready examples, key terms, and RevisionDojo resources for targeted practice.

IB Biology · Dec 1, 2025 · 7 min read

IB Biology: How Checkpoint Controls Ensure Accurate Division

IB Biology guide to checkpoint controls: learn G1, G2, and spindle checkpoints, plus cyclins, CDKs, and p53 to ensure accurate cell division.

IB Biology · Dec 1, 2025 · 6 min read

IB Biology: Pressure Gradients in Transport Systems

IB Biology guide to pressure gradients: learn how fluids move in blood, xylem, phloem, and lungs with exam-ready tips and examples.

IB Biology · Dec 1, 2025 · 6 min read

IB Biology: Why Cell Specialization Keeps Life Alive

IB Biology guide to why cell specialization is essential for multicellular survival, from division of labor to homeostasis, with exam tips and links.

IB Biology · Dec 1, 2025 · 5 min read

IB Biology: Why Light Reactions Need the Calvin Cycle

IB Biology guide to why light-dependent and light-independent reactions depend on each other, with exam-ready links, checks, and quick memory hooks.

IB Biology · Dec 1, 2025 · 6 min read

IB Biology: Why Similar Environments Produce Similar Traits

IB Biology guide to convergent evolution: why similar environments produce similar traits, how to spot analogous structures, and how to answer exam prompts.

IB Biology · Dec 1, 2025 · 6 min read

IB Biology: Phospholipids and Selective Membranes

IB Biology guide to how phospholipids self-assemble into selectively permeable cell membranes, plus transport, fluidity, and exam tips.

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