Practice question

The right choice is D: Overexpressing X and knocking out Y. In PSS- Sec G- Sec metabolites, that matches how the process or concept actually works — the other choices mix up related ideas or use the wrong mechanism. Skip these: A) Overexpressing enzyme X; B) Knockout of enzyme Y; C) Overexpressing X and Z. A quick check: if an option needs energy, pumps, or the opposite direction of movement, ask whether that really applies.