OCR A Level Biology: Enzymes | Questions and Answers with complete solution

What is metabolism? - The sum of all chemical reactions within cells and organisms What is an anabolic reaction? - One which builds a molecule or molecules What is a catabolic reaction? - One which breaks down a molecule or molecules Why do organisms need enzymes in their bodies? - To act as catalysts for their metabolic reactions What are some of the benefits that enzymes provide to organisms? - Mean the organism requires less energy to function, meaning it needs to consume less food and could maintain a lower body temperature. Would also save time. Where do intracellular enzymes act? - Inside cells Where do extracellular enzymes act? - Outside of cells What is the structure of catalyse? - A conjugated globular protein with 4 haem groups in its quaternary structure. Is catalyse intracellular or extracellular? - Intracellular What is the function of catalase? - It breaks down hydrogen peroxide into water and oxygen What is the function of amylase? - Breaks down starch into maltose Where is amylase present, and is it intra or extracellular? - Found in the mouth and small intestine, extracellularWhat is the function of trypsin? - It is a protease, and therefore breaks down proteins into peptides.