Question

When transport proteins simultaneously move two molecules across a membrane in the same direction, the process is called

• A. Uniport
• B. Antiport
• C. Symport
• D. Diffusive port

Answer 1

Answer: (C)

Symport

Some carrier proteins allow transport only if two types of molecules move together. This is called cotransport. It is of two types: symport and antiport method. In symport method of cotransport, both molecules cross the membrane in the same direction at the same time. In antiport method of cotransport, both molecules move in opposite direction. When a molecule move across a membrane independent of other molecule, the process is called uniport.

So, the correct answer is 'Symport'.