6.9 enzymes & digestion

Question 1

where are the 2 types of amylase produced?

Answer 1

salivary glands & pancreas

Question 2

what does the amylases do?

Answer 2

hydrolyses polysaccharides to disaccharides

Question 3

what are the 3 types of membrane-bound disaccharides? what are their hydrolysed products?

Answer 3

maltase: maltose -> glucose + glucose
sucrase: sucrose -> glucose + fructose
lactase: lactose -> glucose + galactose

Question 4

describe the physical breakdown of food during digestion.

Answer 4

• food is broken down into smaller pieces by the teeth & churned by the muscles in the stomach wall

Question 5

which 3 types of peptidases are used for protein digestion?

Answer 5

• endopeptidases
• exopeptidases
• dipeptidases

Question 6

what does endopeptidases do?

Answer 6

hydrolyses peptide bonds between amino acids in the central region of the polypeptide

Question 7

what does exopeptidases do?

Answer 7

hydrolyses peptide bonds on the terminal amino acids at the end of polypeptide chains

Question 8

what does dipeptidases do?

Answer 8

hydrolyses bonds between dipeptides to amino acids