A-Level Biology: Digestion and Absorption Quiz

What is the primary function of digestion?

• To convert insoluble molecules into soluble ones for absorption

• To increase the size of food particles

• To store food within the body

• To transport nutrients directly into the bloodstream

Which of the following enzymes is responsible for the digestion of carbohydrates?

• Lipase

• Amylase

• Protease

• Sucrase

Where does the digestion of carbohydrates begin?

• Stomach

• Large intestine

• Mouth

• Small intestine

What are the products of lipid digestion?

• Fatty acids and glycerol

• Nucleotides

• Amino acids

• Monosaccharides and disaccharides

What role do bile salts play in the digestion of lipids?

• They convert lipids into monosaccharides

• They emulsify lipids into smaller droplets

• They break down peptide bonds

• They absorb lipids into the bloodstream

Which enzyme is involved in the final step of protein digestion?

• Endopeptidase

• Amylase

• Membrane-bound dipeptidase

• Exopeptidase

Where are lipases produced?

• Stomach

• Pancreas

• Salivary glands

• Liver

What is the significance of the large surface area created by bile salts during lipid digestion?

• It decreases the rate of hydrolysis

• It increases the rate of hydrolysis

• It prevents the absorption of lipids

• It stores lipids for future use

What are micelles?

• Spheres that transport fatty acids and monoglycerides to epithelial cells

• Enzymes that digest proteins

• Products of carbohydrate digestion

• Cells that line the stomach

How are monosaccharides absorbed into the epithelial cells of the ileum?

• Passive diffusion

• Osmosis

• Co-transport

• Exocytosis