Digestion Of Carbohydrates

Question 1

What is digestion?

Answer 1

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

Question 2

What is an extracellular enzyme?

Answer 2

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

Question 3

Why can prokaryotes not have extracellular enzymes?

Answer 3

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

Question 4

What is the model answer for the digestion of carbohydrates?

Answer 4

-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.

Question 5

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

Answer 5

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