OCR General Certificate of Secondary Education (GCSE) Biology Practice Exam

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What is the symbol equation for aerobic respiration?

C6H12O6 + 6O2 ---> 6CO2 + 6H2O + Energy
6CO2 + 6H2O ---> C6H12O6 + 6O2 + Energy
Glucose + O2 ---> CO2 + H2O + Energy
CO2 + H2O ---> Glucose + O2 + Energy

The correct answer is: C6H12O6 + 6O2 ---> 6CO2 + 6H2O + Energy

The symbol equation for aerobic respiration shows the transformation of glucose and oxygen into carbon dioxide, water, and energy. In this process, cells utilize glucose (C6H12O6) as an energy source in the presence of oxygen (O2). The products of this reaction are carbon dioxide (CO2) and water (H2O), along with the release of energy, which is crucial for cellular functions. This reaction occurs within the mitochondria of eukaryotic cells and is vital for aerobic organisms, allowing them to convert the energy stored in glucose into a form that can be used for biological work, such as muscle contraction, active transport, and biosynthesis. The equation reflects the stoichiometry of this biological process accurately, emphasizing the inputs and outputs involved in energy production. The other options represent processes that are not aligned with the cellular respiration process that occurs in the presence of oxygen. Some depict stages or reactions related to photosynthesis or anaerobic respiration, which are not applicable to the process of aerobic respiration as outlined in the correct answer.