Question

Select the CORRECT sequence.

1. As a hydrogen ion from the gradient enters ATP synthase, it binds to a rotor subunit causing a small conformational change matt the protein in a clockwise direction.
2. A new rotor subunit is not positioned to bind with the nest hydrogen ion that enters the ATP synthase.
3. As this process continues, the rotor makes a complete rotation, dropping off the hydrogen ion such that it moves to the opposite side of the membrane.
4. The hydrogen gradient diffuses across the cristae and converts its potential energy into mechanical energy
a 1,2,3,4
b 4,3,2,1
c 3,2,4,1
d 2,3,1,4

Answer 1

The correct sequence detailing the function of ATP synthase in chemiosmosis is 3, 2, 4, 1. This sequence describes how the hydrogen gradient powers ATP synthase to generate ATP through a series of mechanical and chemical steps known as chemiosmosis.

Step-by-step explanation:

The correct sequence is 3, 2, 4, 1.

1. As the hydrogen ions diffuse through the ATP synthase, a rotor subunit undergoes a small conformational change in a clockwise direction.
2. Once a hydrogen ion binds to the rotor subunit, a new rotor subunit is positioned to bind with the next hydrogen ion entering the ATP synthase.
3. As the rotor continues to rotate, the hydrogen ion is dropped off on the opposite side of the membrane.
4. The potential energy of the hydrogen gradient is converted into mechanical energy, and the ATP synthase converts ADP to ATP.