Membrane Transport Flashcards

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1
Q

What are the two distinct types of transport proteins that mediate facilitated diffusion?

A

Channel and carrier proteins

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2
Q

What are carrier proteins?

A

Integral glycoproteins which bind a solute and undergo a conformational change to translocate the solute across the membrane
Carrier proteins will only bind a specific molecule via an attachment similar to an enzyme-substrate interaction

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3
Q

What are channel proteins?

A

Integral lipoproteins which contain a pore via which ions may cross from one side of the membrane to the other
Channel proteins are ion-selective and may be gated to regulate the passage of ions in response to certain stimuli
Channel proteins only move molecules along a concentration gradient (i.e. are not used in active transport)

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