IBDP Biology Chapter 1 Notes



These notes have specially been curated by expert teachers to simplify and enlighten concepts given in IB Biology HL. The notes are comprehensive in nature and are sufficient to study the chapter in depth and one need not look for other resources beyond the notes provided on our website which can be accessed for free. The notes for Cell Biology IBDP HL are available on our official website and can be downloaded for free. You are one click away from obtaining all that you need to score well in IB Biology HL.

The material made available on Tychr’s website is available for all IBDP subjects and is specially curated after an extensive amount of effort to ensure that the notes are in consonance with the IB curriculum and are an amalgamation from various textbooks prescribed by the IBO.Students often face a challenge understanding concepts, especially concepts that are new and tricky. These IB Biology Notes will help the student cover the chapter of Cell  Biology  entirely while explaining each and every concept in a detailed and easy way. 

In this chapter of Cell Biology, we will look into the cell theory proposed by Schleiden and Schwan’s along with its exceptions and the basic processes of a living cell. We will also discuss the significance of surface area to volume ratio and how it limits the cell Size because of reduced transport across the membrane. Turning on certain genes helps in gene expression and cell differentiation in stem cells. Stem cells have therapeutic use in various diseases like Stargardt’s disease.

Alternatively, we also explore the differences between eukaryotes (possess nucleus and complex structure) and prokaryotes (no nucleus and simple structure with no compartmentalization) with in depth discussion about the various organelles. We then move into light microscopes , electron microscopes(newer, more expensive, higher resolution) and magnification of these microscopes.

Then we talk about the various models of cell membrane namely the Davson and Danielle model and how it was replaced by the fluid mosaic of Singer and Nicholson which terms how membranes are made up of amphipathic phospholipid bilayer with integral and peripheral proteins embedded in it. This discussion is followed by active transport requiring and passive transport we also dive into the endosymbiotic theory and the various stages of cell division along with how loss of regulations in cell cycle lead to cancer.