Enzymes can be classified based on whether they catalyze reactions inside cells (intracellular) or outside cells (extracellular).
Which of the following processes is a correct description of an extracellular reaction controlled by enzymes?
Hydrolysis of starch to maltose by amylase in the lumen of the duodenum
Breakdown of toxic H2O2\text{H}_2\text{O}_2H2O2 by catalase in the intercellular tissue fluid
Hydrolysis of peptide bonds by active trypsin within the secretory vesicles of pancreatic acinar cells
Synthesis of messenger RNA by RNA polymerase within the cisternae of the rough endoplasmic reticulum
9 exam-style questions on OCR A A Level Biology Enzymes. Each one has a worked solution and a mark scheme showing where the marks go.