Question

if the gene encoding a specific enzyme in the plastoquinone biosynthetic pathway was mutated in a particular cell such that it became completely nonfunctional, what immediate effect would that have on that cell?
multiple choice
the cell would be unable to absorb light energy
the cell would be unable to use light energy to make atp
the cell would be unable to use light energy to make nadph
the cell would be unable to fix carbon

Explanation:

Plastoquinone is involved in the electron - transport chain of photosynthesis. It plays a key role in the transfer of electrons between photosystem II and the cytochrome b6 - f complex, which is essential for the synthesis of ATP using light energy (photophosphorylation). If the gene encoding an enzyme in the plastoquinone biosynthetic pathway is mutated and non - functional, the cell would be unable to use light energy to make ATP. Absorbing light energy is mainly related to pigments like chlorophyll, making NADPH involves ferredoxin - NADP+ reductase, and carbon fixation occurs in the Calvin cycle and is not directly related to plastoquinone biosynthesis.

Answer:

The cell would be unable to use light energy to make ATP