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Functions of Membrane Proteins

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Questions and Answers

What is the main function of aquaporins in the cell membrane?

Passage of water

Which type of membrane proteins span the complete depth of the membrane?

Integral membrane proteins

What is the role of GPCRs in membrane proteins?

Transduce extracellular signals to the intracellular environment

In which type of proteins are beta barrels made of folded beta sheets commonly seen?

Integral membrane proteins Signup and view all the answers

What is the function of MHC complexes in membrane proteins?

Expression of cell identity Signup and view all the answers

What type of proteins can associate with other membrane proteins but are considered soluble?

Soluble proteins Signup and view all the answers

How do peripheral membrane proteins interact with the lipid bilayer?

Associate a part of themselves with a single leaflet Signup and view all the answers

What is the key role of transporters among membrane proteins?

Transport of nutrients Signup and view all the answers

What is the main function of tetraspanins in membrane proteins?

Connection with other cells or extracellular matrix Signup and view all the answers

What distinguishes soluble proteins that associate with other membrane proteins at the membrane?

They can associate with other membrane proteins Signup and view all the answers

What are the two types of lipid anchoring mentioned in the text?

Fatty acid tail and GPI anchor Signup and view all the answers

Why is lipid anchoring important?

To attach specific parts of membrane proteins to the membrane and ensure proper positioning for intracellular signaling. Signup and view all the answers

What is the function of GPI anchor in membrane proteins?

GPI anchor allows attachment of lipid and sugar components to the extracellular side of the membrane. Signup and view all the answers

How do membrane protein associated proteins interact with membrane proteins?

Via non-covalent interactions such as ionic charges. Signup and view all the answers

What is the role of lipid rafts in the cell membrane?

To allow a more directed or concentrated response to specific stimuli in certain areas of the membrane. Signup and view all the answers

How does self-assembly of membrane proteins facilitate cell-cell adhesion?

By restricting the movement of proteins across the cell membrane and aiding in cell shape. Signup and view all the answers

What is the significance of integral membrane proteins recognizing ligands outside the cell?

Recognition of ligands outside the cell requires enzymes to metabolize them before recognition by membrane proteins. Signup and view all the answers

Why do some membrane proteins attach to the cytoskeleton?

To restrict their movement across the cell membrane and aid in shaping the cell. Signup and view all the answers

How do membrane proteins and soluble proteins help organize each other?

By interacting via non-covalent interactions like ionic charges. Signup and view all the answers

What is the main function of membrane protein associated proteins?

To interact with other membrane proteins and participate in signaling pathways. Signup and view all the answers

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