Select a course.
Water, Ions and ATP
infoWhy this? We learn about water, ions and ATP because they are fundamental to almost every biological process: water provides the medium for reactions and transport, ions help maintain conditions and carry signals in cells, and ATP is the main immediate energy source, so understanding them is essential for making sense of topics like nerve impulses, muscle contraction, respiration, photosynthesis and homeostasis.
scheduleWhy now? Having covered biological molecules, cells, membranes and enzymes, you are ready to focus on the key substances that underpin cell environments, signalling and energy supply, which you will rely on in later topics such as respiration, photosynthesis, nerve impulses, muscle contraction and homeostasis.