Question

Which of the following is involved in the intrinsic pathway of apoptosis?

(a) cytochrome a

(b) cytochrome b

(c) cytochrome c

(d) cytochrome d

The question was posed to me in an interview for internship.

This key question is from Cell Signaling and Signal Transduction topic in section Cell Signaling and Signal Transduction of Cell Biology

Answer 1

Correct choice is (c) cytochrome c

To elaborate: Cytochrome c is the compound involved in intrinsic pathway of apoptosis. It is also a component of electron transport chain and mitochondrion. As the process of apoptosis initiates, the cells lose contact with the environment.