Which of the following is not a type of membrane protein?

• A. Integral membrane proteins
• B. Peripheral membrane proteins
• C. Proteogylcan membrane proteins
• D. Lipid anchored membrane proteins

Answer: (C)

Verified step by step guidance

1. Understand the types of membrane proteins: Integral, Peripheral, and Lipid-anchored proteins are all types of membrane proteins with distinct characteristics.
2. Integral membrane proteins are embedded within the lipid bilayer and often span the entire membrane.
3. Peripheral membrane proteins are not embedded in the lipid bilayer. Instead, they are loosely attached to the exterior or interior surfaces of the membrane, often through interactions with integral proteins.
4. Lipid-anchored membrane proteins are covalently attached to lipid molecules within the membrane, anchoring them to the membrane surface.
5. Proteoglycans are not classified as membrane proteins. They are glycoproteins with long carbohydrate chains and are often found in the extracellular matrix, not as a type of membrane protein.