Why can't starch be diffused into simpler sugars before it can enter the cell

Since starch is a dissaccharide and is used in many cellular activities
Carbohydrates get stored in the form of long polymers of glucose molecules or as glycogen starch. They provide energy to the animals for performing their daily duties. Carbohydrates are generally considered the fuel for all organisms, and without this most animals would become sloth and would be unable to perform the regular jobs. Carbohydrates are actually very easy to metabolise and hence generate quick energy.

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