LCQ Higher Level Protein

Short Questions

2008 In relation to protein describe the formation of a peptide bond/link (6)

2007 Name two methods by which protein can be denatured and give an example in each case (6)

2005 Name one food source of each of the proteins listed below. (6)

Protein / Food Source
Albumin
Caesinogen
Collagen
Actin
Gluten
Myosin

2004 Complete the diagram showing the basic chemical structure of an amino acid. (4)

What is an essential amino acid? (2)

SEC Complete the following in relation to the digestion of protein (6)

Digestive Gland / Secretion / Enzymes / Substrate / Products
Stomach / Gastric juice

SP1 Name two sources of High Biological Value Protein. (2)

Using an example to support your answer, explain the term complementary value of protein. (4)

Explain what is meant by the following properties of protein: (i) Denaturation (2)

(ii) Gel formation (2) Give one example of where each of the above are applied in food preparation (2)

SP4 Explain with the aid of a diagram the following types of protein structure:

(a) Primary structure (b) Secondary Structure (c) Tertiary Structure (6)

SP5 Draw a diagram showing the basic structure of an amino acid (2)

Name four essential amino acids (4)

List three effects of heat on protein? (6)

Explain the term essential amino acid. (2)

Give two examples of (i) essential amino acids and (ii) non-essential amino acids. (4)

LCQ Higher Level Protein

Long Questions

2006 Question 1

(b) Name two proteins present in meat. (6)

(d) Describe (i) the primary structure and (ii) the secondary structure of protein (24)

(e) Identify and explain six key factors that a consumer should consider when

purchasing protein foods to ensure economy and safety. (18)

Sample Paper 1 Question 1

Study the table below and answer the questions that follow:

High biological value foods
Complete protein foods / Low biological value foods
Incomplete protein foods
Meat and Fish 80 – 90 %
Milk – Cow’s 95%
Milk – Human 100%
Soya Beans 74%
Eggs 100% / Peas and Beans 35 – 50 %
Rice 76%
Cheese 20 – 30 %
Potatoes 2%
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)

(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 Question 1

(b) Fish is a high protein food. Describe the chemical structure of protein. (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)

(d) What are the biological functions of protein? (16)

(e) Briefly outline the digestion of proteins in the stomach and duodenum. (10)

(f) Vegetarians, in particular vegans, need to be careful of their protein intake. (18)

Define the term TVP and outline how it is produced.

Sample Paper 4 Question 1

Animal Food / % Protein / Plant Food / % Protein
Milk
Cheddar Cheese
Eggs
Beef
Fish
Chicken / 3
26
12
30
21
21 / Soya Beans
Peanuts
Lentils
Bread
Rice
Peas
Potatoes / 40
24
24
8
2
5
2

(a) State the RDA for protein for a teenager. (5)

(b) What are the biological functions of protein? (15)

teenager, ensuring his or her protein requirements are met. (20)

(d) What are the consequences of protein deficiency in the body? (10)

(e) 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? (10)

(f) Describe with the aid of a diagram the chemical structure of an amino acid. (10)

(g) Explain the importance of the supplementary role of protein in the diet of vegans. (10)

LCQ Ordinary Level Protein

Short Questions

2008 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)

2007 Name three sources of protein under each of the following headings: (6) High Biological Value (HBV) Low Biological Value (LBV)

2006 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. (4)

Explain what is meant by primary protein structure. (2)

SEC List the elements found in protein (4)

Explain what is meant by protein denaturation (2)

SP1 What is the elemental composition of protein? (3)

Classify proteins (3)

SP2 What is denaturation in relation to proteins? (3)

Define biological value. (3)

What is an amino acid? (3)

Explain what is meant by protein Deamination. (3)

SP3 What is an amino acid? (3)

List the properties of protein. (3)

SP4 What is the elemental composition of proteins? (3)

List three functions of proteins. (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 / Protein g/per 100g / Biological Value
Milk / 3 / 95%
Meat / 18 / 80-90%
Fish / 17 / 80-90%
Eggs / 12 / 100%
Beans canned in Tomato Sauce / 5 / 35-50%
Oatmeal / 12 / 60%
Rice / 6 / 65%
Tinned peas / 6 / 35-50%
Whole meal bread / 10 / 50%

(a) State why it is important to include protein in a person’s daily diet. (8)

(b) State the difference between high biological value protein and low biological value (8)

protein.

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).

(d) Discuss three major factors that influenced your food choices when drawing up the (12)

menus.

(e) State how the menus you have designed take account of: (16)

· Meal planning guidelines

· Healthy eating guidelines.

(f) State why the percentage of income spent on food is greatest among low income earners. (5)

(g) 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)