DIGESTION ABSORPTION

Question 1

endopeptidases

Answer 1

hydrolyse peptide bonds between amino acids in the middle of a polymer chain

Question 2

exopeptidases

Answer 2

hydrolyse peptide bonds between amino acids at the end of a polymer chain

Question 3

membrane bound dipeptidases

Answer 3

hydrolyse peptide bonds between two amino acids

Question 4

where does protein digestion take place

Answer 4

protein digestion starts in the stomach, continues in the duodenum and is fully digested in the ileum

Question 5

how are lipids digested

Answer 5

by lipase and action of bile salts

Question 6

where is lipase produced

Answer 6

pancreas

Question 7

what does lipase do

Answer 7

hydrolyse the ester bond in triglycerides to form the monoglycerides and fatty acids

Question 8

what are micelles

Answer 8

vesicles formed of the fatty acids, glycerol, monoglycerides and bile salts

they help the products of lipid digestion to be absorbed

Question 9

how do bile salts work

Answer 9

produced by the liver and emulsify lipids- this means they cause the lipids to form small droplets
several small lipid droplets have a bigger surface area than a single large droplet so the formation of small droplets greatly increases the surface are of lipid that’s available for lipases to work on

Question 10

what happens to products of digestion

Answer 10

absorbed across the ileum epithelium into the blood stream