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| Question | Answer |
| Complete the sentences: Fibrous proteins are tough and rope-shaped. They are _________ and strong. They are ___________ proteins and are fairly ___________ (unlike many globular proteins) | Fibrous proteins are tough and rope-shaped. They are INSOLUBLE and strong. They are STRUCTURAL proteins and are fairly UNREACTIVE (unlike many globular proteins) |
| What are the functions and properties of collagen? | Found in animal connective tissues, such as bone, skin and muscle Minerals can bind to it to increase its rigidity (e.g. in bone) Prevents arteries bursting Tendons connect muscles to bones Cartilage Flexible but strong |
| What are the functions and properties of keratin? | Found in many of the external structures of animals Can either be flexible (e.g. skin) or hard and tough (e.g. nails) Many disulphide bridges Very strong Hair, fingernails, hooves, horns, claws Mechanical protection Impermeable barrier to infection |
| What are the functions and properties of elastin? | Found in elastic connective tissue Elastic - allows tissues to return to their original shape when stretched Cross-linking and coiling (strong and extensible) Skin can stretch around bones Lungs can inflate/deflate Bladder can expand Blood vessels can stretch and recoil |
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