Fibrous proteins

Question 1

Fibrous proteins structure

Answer 1

contain long polypeptide chains with repeating
sequences of amino acids that have non-polar r groups
polypeptide chains are able to form fibres which make the proteins stronger

Question 2

FIbrous proteins solubility

Answer 2

amino acids have non-polar R groups, so the proteins are insoluble in water

Question 3

Collagen

Answer 3

fibrous protein used to make bones, tendons and are found in artery walls to help resist the high pressure

Question 4

Keratin

Answer 4

this fibrous protein contains high amounts of cysteine, resulting in disulphide links forming between the two polypeptide chains, which makes the molecule very hard and strong.

Question 5

Elastin

Answer 5

this fibrous protein
has the ability to stretch and recoil. Elastin is stretchy due to coiling of the elastin molecules and cross-links that keep
the molecules together

Question 6

Collagen uses

Answer 6

used to make bones, tendons and are found in artery walls

Question 7

Elastin uses

Answer 7

found in the lungs, bladder and

blood vessel walls.

Question 8

Keratin uses

Answer 8

It is found in fingernails,

hooves and horns.