Properties of proteins

Last updated: 16/02/2022

AQA A-Level Biology Proteins Properties of proteins

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Question 1 of 20

1. Question
What is the best description of denaturation of proteins?
- The unfolding of the protein into a random, less useful shape
- The tight folding into a more useful shape
- The folding into alpha helices
- The unfolding into a more useful shape
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Question 2 of 20

2. Question
What type of protein gives strength to organs?
- Structural proteins
- Cell-membrane proteins
- Enzymes
- Hormones
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Question 3 of 20

3. Question
What type of protein catalyzes biochemical reactions?
- Enzymes
- Cell-membrane proteins
- Structural proteins
- Hormones
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Question 4 of 20

4. Question
What type of protein aids in moving different substances into and out of cells?
- Cell-membrane proteins
- Enzymes
- Structural proteins
- Hormones
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Question 5 of 20

5. Question
Insulin is an example of which type of protein?
- Hormone
- Cell-membrane protein
- Enzyme
- Structural protein
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Question 6 of 20

6. Question
Pepsin is an example of which type of protein?
- Enzymes
- Cell-membrane protein
- Structural protein
- Hormone
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Question 7 of 20

7. Question
Collagen is an example of which type of protein?
- Structural protein
- Enzyme
- Cell-membrane protein
- Hormone
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Question 8 of 20

8. Question
What is the role of haemoglobin?
- It transports oxygen
- It is an antibody
- It regulates blood sugar
- It is involved in muscle contraction
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Question 9 of 20

9. Question
What is the role of actin?
- It is involved in muscle contraction
- It transports oxygen
- It is an antibody
- It regulates blood sugar
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Question 10 of 20

10. Question
What is the role of insulin?
- It regulates blood sugar
- It transports oxygen
- It is an antibody
- It is involved in muscle contraction
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Question 11 of 20

11. Question
What is the role of myosin?
- It is involved in muscle contraction
- It transports oxygen
- It is an antibody
- It regulates blood sugar
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Question 12 of 20

12. Question
What is the role of pepsin?
- It breaks down protein into polypeptides
- It is an antibody
- It gives structural strength
- It is involved in muscle contraction
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Question 13 of 20

13. Question
What is the role of collagen?
- It gives structural strength
- It is an antibody
- It breaks down protein into polypeptides
- It is involved in muscle contraction
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Question 14 of 20

14. Question
What type of protein typically serve structural functions?
- Fibrous proteins
- Globular proteins
- Cell-membrane proteins
- Disordered protein
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Question 15 of 20

15. Question
What do the high levels of the amino acid glycine in collagen polypeptides allow for?
- Close packing in the secondary structure of the polypeptide chain
- Close packing in the primary structure of the polypeptide chain
- Loose packing in the secondary structure of the polypeptide chain
- Loose packing in the primary structure of the polypeptide chain
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Question 16 of 20

16. Question
Which best describes the quaternary structure of collagen?
- Three polypeptide chains wound together with bonds between amino acids of adjacent chains
- Four polypeptide chains wound together with bonds between amino acids of adjacent chains
- Three polypeptide chains wound together with no bonds between adjacent chains
- Four polypeptide chains wound together with no bonds between adjacent chains
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Question 17 of 20

17. Question
Which of the following best explains the strength of collagen fibres?
- Bonds occur between amino acids of adjacent polypeptide chains
- Bonds occur only between amino acids within individual polypeptide chains
- Adjacent polypeptide chains are free to slide passed each other
- The polypeptides are highly branched
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Question 18 of 20

18. Question
Which of the following best explains the strength of collagen fibres?
- The point where individual collagen molecules begin and end is spread throughout the fibre rather than all being in the same place
- Individual collagen molecules in a fibre begin and end in the same place
- Adjacent polypeptide chains are free to slide passed each other
- The polypeptides are highly branched
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Question 19 of 20

19. Question
What do collagen-containing tendons connect?
- Muscles to Bones
- Bones to Bones
- Muscles to Muscles
- Neurons to Bones
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Question 20 of 20

20. Question
Collagen fibres give tendons strength under which type of force?
- Tension
- Compression
- Shear
- All of the above
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