Digestion and Absorption

Bile juice helps in the digestion of fat because it contains

• enzymes

• vitamins

• bile salts

• bile pigments

Where are the disaccharidase enzymes found?

• Microvilli

• Pancreas

• lumen of small intestine

• mouth

The stomach wall produces mucus to cover its surface. Which of the following statements correctly describe(s) the function of the mucus?

(1) It kills the bacteria in the ingested food.

(2) It prevents the rubbing of food against the stomach wall.

(3) It protects the stomach wall from the action of the digestive enzymes.

• (1) only

• (3) only

• (1) and (2) only

• (2) and (3) only

Which type of enzyme hydrolyses peptide bonds in the middle of a polypeptide chain

• exopeptidase

• endopeptidase

• amylase

• dipeptidase

In the alimentary canal, most water is absorbed in the

• oesophagus

• stomach

• small intestine

• colon

In the alimentary canal, bacteria in food are mainly killed by

• saliva

• mucus

• gastric juice

• pancreatic juice

What are absorbed by co-transport?

• monosaccharides only

• fatty acids and glycerol

• monosaccharides and amino acids

• monoglyerides

The liver is said to be a digestive gland because it

• converts stored glycogen into glucose

• breaks down excess amino acids

• produces bile

• stores iron

What is on the outside of micelles?

• fatty acids

• proteins

• bile salts

• triglycerides

Protein digestion occurs mainly in

• 1 and 3

• 2 and 3

• 2 and 5

• 3 and 5