Digestion Of Carbohydrates Flashcards

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1
Q

What is digestion?

A

-Making large insoluble molecules into smaller soluble molecules by hydrolysing bonds in the polymers.

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2
Q

What is an extracellular enzyme?

A

-Enzymes which are secreted out of a cell to do its role

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3
Q

Why can prokaryotes not have extracellular enzymes?

A

They have no membrane bound organelles and no vesicles and they are unicellular so enzymes would be released into the environment.

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4
Q

What is the model answer for the digestion of carbohydrates?

A

-Amylase in saliva hydrolyses starch by breaking the glycosidic bond to from maltose.
-Amylase is denatured in the stomach so there is no carbohydrate digestion there.
-Pancreatic amylase is realised and further hydrolyses any starch left over.
-Maltose is hydrolysed by alpha glucose by breaking the glycosidic bond in the ileum by the enzyme maltase which is a membrane bound enzyme.
-Glucose is then absorbed by co-transport.

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5
Q

What does membrane-bound mean? And why is this good for digestion?

A

-Found in the cell membrane.
-Enzymes can easily get out of the cell membrane as there is only a short distance to travel.

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