Fibrous and globular proteins

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what are the 3 types of fibrous proteins?
collagen, keratin and elastin
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2 properties of collagen
very strong, low solubility
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3 functions of collagen?
1. makes tendons to connect muscles to bones 2. makes cartilage 3. in artery walls to provide strength
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3 properties of keratin
1. many disulphide bonds 2. insoluble 3. very strong
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3 functions of keratin
1. gives physical protection 2. waterproof 3. found in hard parts of body
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2 properties of elastin?
insoluble, allows things to stretch
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3 functions of elastin?
1. helps blood vessels to stretch 2. allows lungs to deflate and inflate 3. stretches skin around bones and muscles
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what are the 3 globular proteins?
haemoglobin, insulin and pepsin
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what is the structure of haemoglobin?
2 alpha chains and 2 beta pleated sheets. with a prosthetic group of iron
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what is the function of haemoglobin
carries oxygen from the lungs to tissues
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what is the structure of insulin?
2 polypeptide chains joined by disulphide bonds.
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what is the function of insulin?
increase the uptake of glucose from blood
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what is the structure of pepsin?
one polypeptide chain made of beta pleated sheets with few basic groups to accept h+ ions
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what is the function of pepsin.
digest protein in stomach
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Other cards in this set

Card 2

Front

2 properties of collagen

Back

very strong, low solubility

Card 3

Front

3 functions of collagen?

Back

Preview of the front of card 3

Card 4

Front

3 properties of keratin

Back

Preview of the front of card 4

Card 5

Front

3 functions of keratin

Back

Preview of the front of card 5
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