LCQ
Higher Level
Protein
Short Questions
2008
2007
2005
In relation to protein describe the formation of a peptide bond/link
Name two methods by which protein can be denatured and give an example in each case
Name one food source of each of the proteins listed below.
Protein
(6)
(6)
(6)
Food Source
Albumin
Caesinogen
Collagen
Actin
Gluten
Myosin
2004
Complete the diagram showing the basic chemical structure of an amino acid.
(4)
C
SEC
What is an essential amino acid?
(2)
Complete the following in relation to the digestion of protein
(6)
Digestive Gland
Stomach
SP1
SP4
SP5
Secretion
Gastric juice
Enzymes
Substrate
Products
Name two sources of High Biological Value Protein.
Using an example to support your answer, explain the term complementary value of protein.
Explain what is meant by the following properties of protein:
(i) Denaturation
(ii) Gel formation
Give one example of where each of the above are applied in food preparation
Explain with the aid of a diagram the following types of protein structure:
(a) Primary structure
(b) Secondary Structure
(c) Tertiary Structure
(2)
(4)
Draw a diagram showing the basic structure of an amino acid
Name four essential amino acids
List three effects of heat on protein?
Explain the term essential amino acid.
Give two examples of (i) essential amino acids and (ii) non-essential amino acids.
(2)
(4)
(6)
(2)
(4)
(2)
(2)
(2)
(6)
LCQ
Higher Level
Long Questions
2006
(b)
Name two proteins present in meat.
(c)
Explain
(i) high biological protein
(ii) essential amino acid
(d)
Describe (i) the primary structure and (ii) the secondary structure of protein
(e)
Identify and explain six key factors that a consumer should consider when
purchasing protein foods to ensure economy and safety.
Protein
Question 1
(6)
(12)
(24)
(18)
Sample Paper 1
Question 1
Study the table below and answer the questions that follow:
High biological value foods
Low biological value foods
Complete protein foods
Incomplete protein foods
Meat and Fish 80 – 90 %
Peas and Beans 35 – 50 %
Milk – Cow’s 95%
Rice 76%
Milk – Human 100%
Cheese 20 – 30 %
Soya Beans 74%
Potatoes 2%
Eggs 100%
Prawns 23%
(a)
Write a note on the biological value of proteins.
(10)
(b)
Why is human milk the most suitable for the feeding of young infants?
(5)
(c)
State the RDA for protein for a teenager (boy and girl)
(5)
(d)
Plan a menu for one day for a teenager, using the foods listed in the chart
(20)
(other foods may be included).
(e)
What is the energy value of protein?
(5)
(f)
Indicate foods from your menu that protein may assist in their absorption.
(10)
(g)
Explain how vegans may obtain an adequate supply of protein in their diet.
(10)
(h)
Meat has become very expensive in recent years. Explain how you would manage the household
budget to keep meat bills down while at the same time ensuring that
the family does not lose out nutritionally.
(15)
Sample Paper 2
Folens: Fish/ Convalescents/ Protein
(b)
Fish is a high protein food. Describe the chemical structure of protein.
Question 1
(24)
Sample Paper 3
Folens: Protein/ Vegetarian/ Novel Proteins
Question 1
Protein plays a vital role in the maintenance of a strong, healthy body. Nutritionists currently
recommend that Irish adults consume at least two servings of protein foods per day.
(a)
Explain what you understand by the following terms:
(20)
(i) Derived protein, (ii) Deamination, (iii) Coagulation, (iv) Denaturation
(b)
What is meant by the term biological value? Give four examples of HBV proteins and four
examples of LBV proteins.
(8)
(c)
Explain, giving examples, the complementary value of protein.
(8)
(d)
(e)
(f)
What are the biological functions of protein?
Briefly outline the digestion of proteins in the stomach and duodenum.
Vegetarians, in particular vegans, need to be careful of their protein intake.
Define the term TVP and outline how it is produced.
Sample Paper 4
Animal Food
% Protein
Plant Food
% Protein
Milk
3
Soya Beans
40
Cheddar Cheese
26
Peanuts
24
Eggs
12
Lentils
24
Beef
30
Bread
8
Fish
21
Rice
2
Chicken
21
Peas
5
Potatoes
2
(a)
(b)
(c)
(d)
(e)
(f)
(g)
State the RDA for protein for a teenager.
What are the biological functions of protein?
From the above chart and using other foods, compile a menu for one day for a
teenager, ensuring his or her protein requirements are met.
What are the consequences of protein deficiency in the body?
Animal foods, particularly red meat and dairy products, are rich in protein but also
tend to be rich in saturated fat and calories. How may individuals suffering from
coronary heart disease (CHD) ensure that their protein requirements are met?
Describe with the aid of a diagram the chemical structure of an amino acid.
Explain the importance of the supplementary role of protein in the diet of vegans.
(16)
(10)
(18)
Question 1
(5)
(15)
(20)
(10)
(10)
(10)
(10)
LCQ
Ordinary Level
Protein
Short Questions
2008
2007
2006
Complete the following statement in relation to the digestion of protein using the words listed
below.
Enzyme
pancreas
casein
In the stomach the _____________ rennin changes Caesinogen to ______________
In the duodenum the enzyme trypsin from the __________________ changes peptones
to peptides.
(6)
Name three sources of protein under each of the following headings:
(6)
High Biological Value (HBV) Low Biological Value (LBV)
Complete the following:
(4)
Amino acids (digested proteins) pass through the walls of the _______________
into the capillary network which joins up to form the ________________ which carries
the nutrients to the liver.
2005
List the elements found in protein.
Explain what is meant by primary protein structure.
(4)
(2)
SEC
List the elements found in protein
Explain what is meant by protein denaturation
(4)
(2)
SP1
What is the elemental composition of protein?
Classify proteins
(3)
(3)
SP2
What is denaturation in relation to proteins?
Define biological value.
What is an amino acid?
Explain what is meant by protein Deamination.
(3)
(3)
(3)
(3)
SP3
What is an amino acid?
List the properties of protein.
(3)
(3)
SP4
What is the elemental composition of proteins?
List three functions of proteins.
(3)
(3)
LCQ
Ordinary Level
Protein
Long Questions
SEC
Question 1
The table shows the amount and the biological value of the protein present in a range of foods.
Food
Milk
Meat
Fish
Eggs
Beans canned in Tomato Sauce
Oatmeal
Rice
Tinned peas
Whole meal bread
(a)
(b)
(c)
(d)
(e)
(f)
(g)
Protein g/per 100g
3
18
17
12
5
12
6
6
10
Biological Value
95%
80-90%
80-90%
100%
35-50%
60%
65%
35-50%
50%
State why it is important to include protein in a person’s daily diet.
(8)
State the difference between high biological value protein and low biological value
(8)
protein.
The recommended daily allowance (RDA) of protein for a teenager is 60 – 80 grams.
(16)
Using the information from the above table draw up a set of menus for one day for a teenager
which will provide the necessary RDA of protein. (Other foods can be added).
Discuss three major factors that influenced your food choices when drawing up the
(12)
menus.
State how the menus you have designed take account of:
(16)
 Meal planning guidelines
 Healthy eating guidelines.
State why the percentage of income spent on food is greatest among low income earners.
(5)
Suggest three ways to reduce the weekly food bill for a low income family without affecting
the nutritional value.
(15)
Sample Paper 1
Food Pyramid/ Calcium / Protein
Question 1
(b)
Identify the main sources of protein in the pyramid
(4)
(g)
Explain how vegetarians can achieve their RDA for protein.
(12)
(h)
Animal protein has become very expensive. How would you manage the household budget to
keep animal protein bills down while at the same time ensuring that the family gets enough
protein?
(15)
Sample Paper 4
Meat / Protein
Question 1
(b)
Meat is considered an important protein food. State the RDA for protein for a teenager. (5)
(d)
How has the RDA for protein been met each day in your menus?
(10)