Question

A researcher is investigating the effects of a chemical that makes thylakoid membranes permeable to hydrogen ions ( + H ). Which of the following is the most likely direct effect of adding the chemical to plant cells?

- The plant cells will produce less NADPH.

- The chloroplasts will generate less ATP.

- Chlorophyll will require less light energy to excite its electrons.

- The plant cells will split fewer water molecules into hydrogen ions and oxygen.

Answer 1

Ans - The chloroplast will generate less ATP if they added this chemical directly to the plant cells because this chemical increase the permeability of thylakoid membranes to hydrogen ions ( + H ). ATP synthesis occurs when the proton gradient forms inside the thylakoid membrane so if the thylakoids membrane becomes more permeable to hydrogen ion than the proton gradient will not form inside the membrane and low or no ATP SYNTHESIS OCCURS IN THIS CASE.

so option B - The chloroplasts will generate less ATP is the right answer