(a)
The perichondrium contains collagen fibres, composed of collagen molecules.
Collagen is an example of one type of biological molecule.
State the name of the type of biological molecule of which collagen is an example.
[ 1 ]
[Maximum number: 1]
The diagram shows some of the relationships between cellulose, collagen and haemoglobin.
Which row is correct?
1
2
3
4
5
cellulose
carbohydrate
collagen
protein
haemoglobin
cellulose
fibrous
haemoglobin
structural
collagen
haemoglobin
globular
cellulose
carbohydrate
collagen
haemoglobin
protein
collagen
structural
cellulose
[Maximum number: 1]
The table shows some features of collagen and haemoglobin.
Which row is collagen?
type of protein
number of polypeptides
solubility in water
fibrous
three
insoluble
fibrous
four
soluble
globular
three
insoluble
globular
four
soluble
[Maximum number: 1]
Which statements about collagen molecules are correct?
1 Both types of secondary structure occur within the molecules.
2 Large numbers of hydrogen bonds stabilise the molecules.
3 Repeated amino acid sequences determine the tertiary structure.
A
1, 2 and 3
B
1 and 2 only
C
1 and 3 only
D
2 and 3 only
[Maximum number: 4]
A molecule of collagen consists of three identical polypeptides that form a triple helix.
The amino acid glycine forms one third of the amino acids in a collagen molecule.
Fig. 5.1A shows a polypeptide molecule during protein synthesis. A molecule of glycine is shown just before it is added to the polypeptide.
Fig. 5.1
(a)
Collagen is a fibrous protein.
Explain how the structure of collagen is related to its functions within the mammalian body.
[ 4 ]