Question

Correct sequence of electron acceptor in ETC Cycle of ATP synthesis is
A. Cyt a1, a, b, c
B. Cyt b, c, a, a3
C. Cyt b, c, a3, a
D. Cyt c, b, a, a3

Answer 1

Hint: Cytochromes are found in the films of Mitochondria which are inserted in its layer and half part is available in the internal layer space.

Complete answer:
To know the cause and development of the electron transport anchor realize that oxygen was absent when the main utilization of layers to change over vitality began. The membranous ATPase that can change over the section of particles through the layer to vitality as ATP (changed over from ADP) was at first utilized halfway the other way to build up a membranous potential, incompletely to change over film potential made by a basic, rhodopsin based electron transporter to synthetic vitality.
These employments of the ATPase were not needy of the rising degrees of oxygen. The significantly more perplexing electron transport chain then again was fabricated stage by stage when oxygen began showing up, which brought about electron benefactors like certain iron particles. Use of these was facilitated with the inceptions of layer buildings I and II, and inevitably likewise III. Complex IV was possibly fabricated when free oxygen was accessible to the living beings straightforwardly. Presumably we can thank the moderate ascending of oxygen level for the structure of the compelling vitality move instrument that has come about.
There likewise exists a more straightforward course, that is now and again utilized for example by plants, just to dispose of oxygen, not making vitality. It is significant that we comprehend that the electron transport chain is the last expansion to the digestion and glycolysis the initial segment to set up. There are some researchers who place the inverse, that the electron transport chain and Krebs cycle built up first. We ought to caution against along these lines of reasoning, which likewise set that there has been a container neck in the development of life.

So, the right answer is B

Note: Cytochromes go under Complex 4 where from cytochrome B we get cytochrome C and from cytochrome C we get cytochrome A and from it we get cytochrome A3 which further gives us oxygen.