Nutrition

Teeth are important in the process of digestion because they

I turn insoluble food molecules into soluble food molecules

II break down large food molecules to smaller molecules

III increase the surface area of pieces of food

• I only

• III only

• II and III only

• I, II and III

Four different types of teeth are shown in the image. Which plays the LEAST significant role in digestion in humans?

• A

• C

• B

• D

Which of the following would NOT help the enamel in its role of protecting the tooth?

• It covers the grown of the tooth

• It is extremely hard

• It can be dissolved by acid in the mouth

• It is relatively easy to clean

Which structure's contents have a pH of between 1 and 2

• D

• E

• F

• G

Where is digestion completed?

• D

• E

• F

• G

By what process does food move through structure C?

• swallowing

• peristalsis

• plasmolysis

• translocation

People who have their gall bladders removed are MOST likely to avoid eating

• mangoes

• fried bacon

• boiled potatoes

• lettuce

Which enzyme is responsible for completing the digestion of proteins?

• erepsin (peptidase)

• pepsin

• amylase

• trypsin

Which of the following is/are of LITTLE help in efficiently absorbing digested food in the ileum?

• circular muscles in the ileum walls

• a network of blood capillaries inside each villus

• microvilli

• the ileum being about 5 m longs

Which of the following substances are absorbed into the structure labelled for nutrient absorption?

• monosaccharides, fatty acids, amino acids and vitamin D

• starch, amino acids, minerals and vitamin C

• monosaccharides, amino acids, minerals and vitamin C

• glucose, protein, fatty acids and vitamin B