IB Biology (first exams 2025) notes for Theme B, by syllabus code.
Biology › Cell biology › Cellular chemistry Cellular Chemistry: Biomolecules, Enzymes and ATP Biomolecules for IB and NEET: water, carbohydrates, lipids, proteins and nucleic acids, how enzymes work and are inhibited, the structure of ATP and how cells release energy by respiration. HL-only content is marked. IB B1.1 / B1.2 / A1.2 / C1.1 / […]
Biomolecules: 4 Essential Topics, Enzymes and ATP (IB, NEET) Read More »
Home › IB Biology › Blood, heart and circulation Blood, Heart and Circulation Blood is a fluid connective tissue made of plasma and formed elements: red blood cells, white blood cells and platelets. The heart is a four-chambered muscular pump that drives blood through a double circulation, the pulmonary circuit to the lungs and the
Blood, Heart and Circulation: IB Biology B3.2 Notes (SL and HL) Read More »
Home › IB Biology › Cell biology › Cell differentiation and stem cells Cell Differentiation and Stem Cells Cell differentiation is the process by which an unspecialized cell becomes specialized for a particular function by expressing some of its genes and not others. Stem cells are unspecialized cells that can divide again and again and
Cell Differentiation and Stem Cells for IB B2.3 and NEET Read More »
Cell membrane notes for IB Biology B2.1: phospholipid bilayer, fluid mosaic model, membrane proteins, cholesterol and permeability, with diagrams and quizzes.
Cell Membrane and the Fluid Mosaic Model (IB Biology B2.1) Read More »
Home › IB Biology › Human physiology › Gas Exchange and the Respiratory System Gas Exchange and the Respiratory System Gas exchange is the diffusion of oxygen into an organism and carbon dioxide out of it across a thin, moist, permeable surface with a large area. In humans it happens in the alveoli of the
Gas Exchange and the Respiratory System for IB B3.1 and NEET Read More »
Learn membrane transport for IB Biology: simple and facilitated diffusion, osmosis, active transport, endocytosis and exocytosis, with clear diagrams and exam tips.
Membrane Transport (IB B2.1): Diffusion, Osmosis, Active Transport Read More »
