The major nutrients required for a healthy diet are carbohydrates, proteins and lipids. The digestive system breaks down large molecules of food, which are then absorbed into the bloodstream.
What molecules are the buillding blocks of proteins?
Amino acids
Fatty acids
Sugars
Which chemical test is used to detect the presence of glucose in food?
Benedict's test
Iodine test
Sudan III test
The digestion of which food molecule by enzymes begins in the mouth?
Glucose
Protein
Starch
Which secretion is released into the duodenum?
Bile
Hydrochloric acid
Saliva
What is the main function of the small intestine?
Absorption of digested food molecules
The breakdown of starch into maltose
The absorption of water from the gut
What is an active site?
The part of a substrate that binds to an enzyme
The region of an enzyme that binds to the substrate
A biological catalyst
The enzyme amylase breaks down which food chemical?
Lipids
Which is the major region of the gut where lipids are broken down
Mouth
Stomach
Small intestine
Which statement is true of enzyme activity?
Enzyme activity depends on the number of collisions between the enzyme and substrate
Most enzymes are not sensitive to temperature
Extremes of pH are unlikely to denature an enzyme
What is the function of bile?
Bile contains a mixture of digestive enzymes
Bile emulsifies lipids
Bile contains hydrochloric acid to provide the optimum pH for pepsin activity