There are two types of proteins, fibrous and globular.
Fibrous - These are proteins formed by parallel polypeptide chains held together by crosslinks.
- Long, rope-like fibre.
- High tensile strength.
- Insoluble in water.
Examples include:- collagen (in skin'), keratin (nails, hair etc), silk.
Globular - Forms a spherical shape.
- Caused by tightly folded polypeptide chains.
Examples include:- Transport proteins (haemoglobin etc), Enzymes (e.g. lipase) and hormones (oestrogen, insulin etc).
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