Digestion & Cellular respiration 1

Nutrients are chemical substances in food that provide a source of energy for our body vital activities only.

• True

• False

Nutrients consists of carbohydrates, proteins and fats only.

• True

• False

Which of the following is the main functions of carbohydrates?

• Form new protoplasm for growth.

• Form enzymes and antibodies.

• Form cell membranes.

• Serve as primary source of energy.

Which of the following is the function of proteins? More than 1 answer.

• serve as primary source of energy

• form enzymes and antibodies

• form new protoplasm for growth and repair

• form insulating material to prevent heat loss

Which of the following is the function of fats? More than 1 answer.

• serve as a source of energy (second choice

• form cell membranes

• form new protoplasm for growth and repair

• form enzymes

Which food test is used to identify the presence of reducing sugar?

• Benedict's test

• Biuret Test

• Iodine test

• Ethanol emulsion test

Which food test is used to identify the presence of protein?

• Benedict's test

• Biuret Test

• Iodine test

• Ethanol emulsion test

Which food test is used to identify the presence of fats?

• Benedict's test

• Biuret Test

• Iodine test

• Ethanol emulsion test

What is the observation for Biuret test if protein is present?

• colourless

• blue colouration

• violet colouration

• blue-black colouration

What is the observation for Benedict test if reducing sugar is present?

• colourless

• blue colouration

• brick-red precipitate

• blue-black colouration