In a symport:
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. both molecules cross the membrane in the same direction.
In a symport, both molecules cross the membrane in the same direction. Symport is a type of active transport where two or more molecules are transported across a membrane simultaneously, moving in the same direction. This process typically requires energy, often in the form of ATP, to move the molecules against their concentration gradient. Symports are crucial in various biological processes, including nutrient absorption and ion transport, where coupled transport of molecules helps maintain cellular homeostasis.