Enzymes required for respiratory chain are present on/in:

Explanation

Cristae (singular: crista) are internal, folded structures found in the inner mitochondrial membrane. Mitochondria are membrane-bound organelles known as the "powerhouses of the cell" due to their role in energy production through oxidative phosphorylation. Cristae provide an increased surface area for various mitochondrial activities, especially those related to the electron transport chain and ATP synthesis.