Which of the Following Is/are Mobile Electron Carrier(s)

Question

Which of the following is/are mobile electron carrier(s)?
A.UQ
B.Cyt c
C.Complex III
A) A only
B) B only
C) C only
D) B & C
E) A & B

Accepted Answer

UQ (ubiquinone) is a lipid-soluble electron carrier that is anchored to the inner mitochondrial membrane, therefore it is not considered mobile. However, Cyt c (cytochrome c) is a small water-soluble protein that is able to diffuse through the intermembrane space, making it a mobile electron carrier. Complex III (cytochrome bc1 complex) is not a mobile electron carrier, but rather it contains both Cyt c and UQ in its enzymatic complex. Therefore, the correct answer is E, which includes the mobile electron carrier Cyt c and the immobilized carrier UQ.

Which of the following is/are mobile electron carrier(s)?A.UQB.Cyt cC.Complex III

Which of the following is/are mobile electron carrier(s)?
A.UQ
B.Cyt c
C.Complex III