BRAINCAKEHaemoglobin
Haemoglobin is a globular protein containing iron that facilitates the transport of oxygen in red blood cells.
Haemoglobin is made up of two alpha and two beta subunits joined together by disulfide bridges.
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Key terms in this lesson
- disulfide bridge
- A covalent bond formed between two cysteine residues that helps stabilise the tertiary or quaternary structure of a protein.
- globular protein
- A water-soluble, roughly spherical protein folded so that hydrophilic R groups face outwards, such as an enzyme or haemoglobin.
- prosthetic group
- A non-protein group that is permanently and tightly bound to a protein and is needed for it to function, such as the haem group in haemoglobin.
More in Biological Molecules
- Hydrolysis of Peptides
- Globular Proteins
- Insulin
- Conjugated Proteins
- Catalase
- Fibrous Proteins
- Keratin
- Elastin
All 63 lessons in Biological Molecules · All OCR AS-level Biology topics