Question

What do A, B, C and D represent in the following figure?

• A. A : Carrier protein, B : Symport, C : Uniport, D : Antiport
• B. A : Carrier protein, B : Uniport C : Antiport, D : Symport
• C. A : Carrier protein, B : Antiport, C : Symport, D : Uniport
• D. A : Carrier protein, B : Uniport, C : Symport, D : Antiport

Answer 1

The correct option is B A : Carrier protein, B : Uniport C : Antiport, D : Symport

Carrier proteins are integral membrane proteins that exist within and span the membrane across which they transport substances.

Antiport transports two molecules/anions/cations at once through the membrane in opposite directions.

Symport transport moves two molecules/anions/cations simultaneously across a cell membrane in the same direction.

Uniport transport mechanism drives a single ion across a membrane and not coupled with transport of any other compound or ion.

So, the correct answer is 'A : Carrier protein, B : uniport C : antiport, D : symport'