Biology 2.2.10 Proteins 3: Fibrous + Gobular Proteins Flashcards
1
Q
what are the properties of collagen?
A
- fibrous protein
- provides mechanical strength
- used in artery walls to prevent it from bursting
- tendons are made of collagen and connect muscles to bones
- cartilage + connective tissues are made of collagen
- bones are also made of collagen
2
Q
what are the properties of keratin?
A
- fibrous protein
- rich in cysteine (has a lot of disulfide bridges)
- found in body parts that are made to be hard such as nails, horns, hair etc
- waterproof
- prevents entry of water-borne pollutants
- creates impermeable barrier to infection
3
Q
what are the properties of elastin?
A
- fibrous protein
- found in living things that need to stretch such as skin
- elastin in lungs slows inflation + deflation
- helps blood vessels to stretch as blood is pumped through them
4
Q
what is the structure of haemoglobin?
A
- globular protein
- made up of 4 polypeptides: alpha globin and beta globin chains
- has a prosthetic group which holds haem groups and an iron ion
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