Question

In mitochondrial electron transport system

• A. Number of ATP molecules synthesised does not depend on nature of electron donor
• B. Ubiquinone receives reducing equivalents via FADH₂ also
• C. Cytochrome c is a large protein attached to outer surface of inner mitochondrial membrane
• D. Complex IV has cyt. $a$ and cyt. $a_3$ but no copper centres

Answer 1

Answer: (B)

The electron transport chain consists of four different complexes such as Complex I, Complex, II, Complex, III, and Complex, IV. Complex I transfers the electron from NADH to ubiquinone and Complex II transfers the electron from Succinate to Ubiquinone. In mitochondrial electron transport system, Ubiquinone receives reducing equivalents via FADH₂ also.
i. $NAD{H}_2\stackrel{ETC}{\to }3ATP$
ii. $FAD{H}_2\stackrel{ETC}{\to }2ATP$
iii. Small protein
iv. Two copper centres