Question

The given diagram shows transport method of two molecules A and B together. Identify I, II and III and choose the correct option.

• A. (I)-Uniport, (II)-Symport, (III)-Antiport
• B. (I)-Uniport, (II)-Antiport, (III)-Symport
• C. (I)-Symport, (II)-Uniport, (III)-Antiport
• D. (I)-Antiport, (II)-Uniport, (III)-Uniport

Answer 1

Answer: (B)

In the given diagrams, I is uniport, II is antiport and III is symport.
• Uniport occurs when a molecule moves across a membrane independent of other molecules.
• Antiport occurs when the two types of molecules move in opposite directions.
• Symport occurs when the two types of molecules cross the membrane in same direction.