GCSE Protein

Question 1

Give 6 functions of protein

Answer 1

1. Basis of body structures such as muscles, skin and hair
2. Needed to facilitate growth, particularly during pregnancy, childhood and adolescence
3. help to repair damaged body tissues or recover after illness
4. Produce enzymes for digestion
5. Produce hormones that regulate body functions
6. provide a secondary source of energy (1g provides 4 kcal)

Question 2

Name 4 animal sources of protein

Answer 2

Beef
Chicken
Lamb
Pork
Fish
Eggs
Milk
Cheese

Question 3

Name 4 plant sources of protein

Answer 3

Cereals
Bread
Pulses - Peas, Beans, Lentils
Nuts

Question 4

Proteins are made of of building blocks. What are these building blocks called?

Answer 4

Amino acids

Question 5

What are dispensable and indispensable amino acids?

Answer 5

Dispensable - amino acids that can be produced in the body
Indispensable -amino acids that can’t be produced in the body and must be produced by diet

Question 6

What are high biological value proteins?

Answer 6

It is a food that contains all the indispensable amino acids required by humans

Question 7

What are low biological value proteins?

Answer 7

This is a food that lacks one or more indispensable amino acids required by humans

Question 8

What is complementary action of protein? Give a food example

Answer 8

It is where 2 low biological foods are eaten in a meal or snack. The one or more missing indispensable amino acids (limiting amino acid) from one food will compensate for the other e.g. beans on toast

Question 9

What is the deficiency of Protein?

Answer 9

Can delay growth in children.

Protein energy malnutrition occurs in developing countries and mainly affects young children.