This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Enzymes, Subject name: Biochemistry
[{'content': 'Example of enzyme specificity: \nSelect and explain. \nA. Stereo specificity, B. Reaction specificity, C. Substrate specificity, D. All of these', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D. All of theseEnzymes are highly specific in their action as compared with chemical catalysts. Three types of enzyme specificities are well-recognized.(a) Stereospecificity: The enzymes act only on one isomer and therefore exhibit stereoisomerism. e.g., L-amino acid oxidase on L-amino acids; hexokinase on D-hexose (Note: isomerases do not exhibit stereospecificity).(b) Reaction specificity The same substrate can undergo different types of reactions, each catalyzed by a separate enzyme e.g., amino acids undergoing transamination, decarboxylation etc.(c) Substrate specifity This may be absolute, relative or broad e.g., urease, ligase, hexokinase.', 'role': 'assistant'}]