Introduction to cellular respiration

    • Cellular respiration is a core JC2 topic in H2 BIOLOGY in A levels. This is a very important process that the cell relies on to get energy in the form of ATP, the hydrolysis of which drives the metabolic processes. It comprises processes such as glycolysis, link reaction, Krebs cycle and oxidative phosphorylation. These processes occur in the cytoplasm, mitochondrial matrix and the latter between matrix, intermembrane space and the inner mitochondrial membrane respectively.
    • Prerequisites for this topic includes cell organelles, enzymes and will build into photosynthesis and diversity & evolution.

    A selection of materials for cellular respiration

    Most common phrasing errors made by students during exams

    • Link reaction and Krebs cycle occurs in the mitochondria
    • One of the electron carriers in the electron transport chain is a proton pump
    • Fermentation produces only 2 ATP molecules which is why it has a low yield compared to aerobic respiration
    • ATP synthase accepts electrons and is part of the ETC

    Exam tips

    • This topic is tied closely to photosynthesis, establish their relationship when you prep for essays
    • Default to conversion rates for 2.5/1.5 ATP per NADH/FADH2 since majority of TYS use this rate
    • Either NAD+/NADH or NAD/reduced NAD is fine
    • Electron carriers are proteins
    • Ethanal = acetaldehyde

    Questions and other matters

    • JOIN my classes so that you can have your questions answered. You will also be able to access TYS questions from different JCs in Singapore as well as my comments and recommended answers.
    • You can also register for my H2 BIO crash courses to get ready for exams. Here’s the SCHEDULE.
    • You may also be interested to know how to boost your performance for A levels.