Biochemistry Barbiturates act on which step of mitochondrial respiratory chain? A Compelx 1 to co-enzyme Q B Compelx 2 to co-enzyme Q C Co-enzyme Q to compelx 3 D Cytochrome C to compelx 4 💡 Explanation Barbiturates act on which step of mitochondrial respiratory chain? ✓ Correct Answer: A. Compelx 1 to co-enzyme Q