Question

multiple choice question
sucrase digests _.
o only sucrase
o sucrose and glucose
o any disaccharide

Explanation:

Enzymes are specific in their action. Sucrase is an enzyme that acts on sucrose, breaking it down into glucose and fructose. It does not act on itself, and it is not a general - acting disaccharide - digesting enzyme.

Answer:

No option is correct as sucrase digests only sucrose to glucose and fructose. But if we assume the closest correct - like option based on the given ones, none of the provided options are fully accurate. If we had to pick the most relevant one, it would be that sucrase digests only sucrose (but this is still an incomplete answer as it also produces fructose upon digestion of sucrose). If forced to choose from the given options, the best option is "only sucrase" is incorrect as enzymes don't digest themselves, "sucrose and glucose" is incorrect as it doesn't digest glucose, and "any disaccharide" is incorrect as it is specific to sucrose. But if we had to pick one, the closest in the sense of substrate specificity would be that it digests only sucrose (though the full story is more complex with the production of fructose too). So, if we must choose, the closest is "only sucrase" is wrong, "sucrose and glucose" is wrong, "any disaccharide" is wrong, but if forced, the most relevant is that it acts on sucrose specifically so we could say (even though not fully correct) "only sucrase" is the least wrong among them in terms of substrate specificity concept. But a proper answer would be that sucrase digests sucrose to glucose and fructose.