Question

Cytochromes are critical participants in the electron transport chains used in photosynthesis and cellular respiration. How do cytochromes donate and accept electrons?

Answer 1

The cytochrome donate electrons exited by photons to other cytochromes the accept electron as replacements for lost electrons.

Each cytochromes has an iron-containing heme group that accepts electrons and than donates the electrons to a more electronagative substance.

Every cytochrome iron-containing heme group accepts electron from oxygen and donates the electrons to the next cytochrome in the chain.

Cytochromes donate electrons directly to the energy - carrier molecule NAD* and FAD and accept electrons from less electronegative substance.