Question

During active absorption, the carrier ion complex rotates at

• A. 180${}^0$
• B. 60${}^0$
• C. 270${}^0$
• D. 45${}^0$

Answer 1

The correct option is A 180${}^0$

Carrier molecules present in the root membrane form bonds with the minerals present outside in form of ions, resulting in a carrier -ion-complex that can move across the membrane. Then the carrier -ion-complex rotates 180° in the membrane so that ion protein complex faces to the inner side of membrane. On the inner surface of the membrane, this complex breaks releasing ions into the cell while the carrier goes back to the outer surface to bind new ions. Thus the correct answer is option A.