Fibrous proteins

Question 1

Fibrous proteins are

Answer 1

are long strands of polypeptide chains that have cross-linkages due to hydrogen bonds

Question 2

Do fibrous proteins have a tertiary structure

Answer 2

They have little or no tertiary structure

Question 3

Due to the large number of hydrophobic R groups fibrous proteins are

Answer 3

fibrous proteins are insoluble in water

Question 4

Fibrous proteins have a limited number of amino acids with the sequence usually being

Answer 4

highly repetitive

Question 5

The highly repetitive sequence creates very organised structures that are ……………and this along with their ………..property, makes fibrous proteins very suitable for structural roles,

for example, ……… that makes up hair, nails, horns and feathers and ……….which is a connective tissue found in skin, tendons and ligaments

Answer 5

strong and insoluble

structural

keratin

collagen

Question 6

Exam Tip
To distinguish between the two proteins, learn SAFES

Answer 6

(Shape, Amino acid sequence, Function, Examples and Solubility).