Quiz on Proteins (2.4)
[14 marks]
1.
Which of the following correctly shows a peptide bond between two amino acids?
(Total 1 mark)
2.
How many molecules of water are required to completely hydrolyse a polypeptide made up of 23 amino acids?
A. 11
B. 22
C. 23
D. 44
3.
What is denaturation?
(Total 1 mark)
A. A structural change of a protein that results in the loss of its biological properties
B. A change in the genetic code of an organism
C. A change in the amino acid sequence of a protein causing a disruption of its 3D shape
D. The process by which amino acids are broken down and ammonia is released
(Total 1 mark)

4.
State definition of the proteome .
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(1)
5.
State four functions of proteins, giving a named example of each.
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(4)
6.
The complex structure of proteins can be explained in terms of four levels of structure.
(a) Tertiary structure in globular proteins involves the folding of polypeptides. State one type of bond that stabilizes the tertiary structure.
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(1)
(b) Outline the quaternary structure of proteins.
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(2)

7.
Proteins can be characterised as either being fibrous or globular.
(a) State one example of a fibrous protein and one example of a globular protein.
Fibrous protein: ...........................................................................................................
Globular protein: .........................................................................................................
(b) Compare and contrast the structure of fibrous and globular proteins.
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(1)
(2)