Biochemistry
Biochemistry
9th Edition
ISBN: 9781319114671
Author: Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher: W. H. Freeman
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Chapter 18, Problem 1P
Interpretation Introduction

Interpretation:

The complex which is not the part of respirasome.

Concept introduction:

An electron transport chain (ETC) is the series of redox reactions that involves the transfer of electrons from electron donors to electron acceptors. This transfer of electrons is coupled with the proton transfer (H+) across the membrane. This then creates the electrochemical gradient resulting in the formation of ATP.

Expert Solution & Answer
Check Mark

Answer to Problem 1P

Option (b), complex II.

Explanation of Solution

Reason for correct option:

Option (b) is complex II. Respirasomes are the supramolecular compounds that are found in mitochondria. They are formed by the association of two or more protein complexes involved in the ETC. Complex I/III, complex I/III/IV, and complex III/IV respirasomes found in mitochondria. Complex II is found in free floating form and does form respirasome. Hence, this option is correct.

Conclusion

Reasons for incorrect options:

Option (a) is complex I. complex I forms respirasome with complex III and IV. Hence, this option is incorrect.

Option (c) is complex III. Complex III forms respirasome along with the complex I and the complex IV. Hence, this option is incorrect.

Option (d) is complex IV. Complex IV forms respirasome along with the complex I and the complex III. Hence, this option is incorrect.

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