Please explain why as well! 1. Cytochrome C is responsible for A. Transfer of el
ID: 271664 • Letter: P
Question
Please explain why as well!
1. Cytochrome C is responsible for
A. Transfer of electrons between complexes I & II
B. Movement of protons out of the mitochondria and into the cytosol C. Transfer of electrons between complexes III & IV
D. Uncoupling ATP synthesis from the electron transport chain E. None of the above
2. In the mitochondrion, the “compartment” or component which has the most acidic pH would be the
A. Matrix
B. Outer mitochondrial membrane
C. Inner mitochondrial membrane
D. Intermembrane space
3. Which electron transport chain component below has the greatest (most positive) E’0?
would be
A. Complex III
B. Complex I
C. O2
D. Complex II
E. ATP synthase
F. Complex IV
Explanation / Answer
Cytochrome C is responsible for
ANSWER IS:
C. Transfer of electrons between complexes III & IV
EXPLANATION :
NADH+H+ ? Complex I ? Q ? Complex III ? cytochrome c ? Complex IV ? H2O
?
Complex II
?
Succinate
Q passes electrons to complex III that passes them to cyt c. Cyt c passes electrons to Complex IV that uses the electrons and hydrogen ions to reduce oxygen to water.
2. In the mitochondrion, the “compartment” or component which has the most acidic pH would be the
ANSWER IS : D. Intermembrane space
EXPLANATION :
The intermembrane space is more acidic than the matrix and is enclosed by the outer and the inner membrane of the organelle.
The pH of the Intermembrane space will be higher than that of the Matrix and same as that of the cytosol
Low pH increases the concentration of base to pump out H+ to the inter membrane space that causes ATP production.
3. ANSWER IS :
C. O2
EXPLANATION :
A substance whuch hasgreater tendency to donate electrons in the reduced form has a more negative E'0
A substance with a weak tendency to donate electrons in the reduced form has positive E’0.
For example, first electron carrier having most negative Eo
1)NADH to ubiquinone.
2)succinate to ubiquinone.
3)ubiquinol to cytochrome.
4)cytochrome to O2.
NADH has a strong tendency to donate electrons
Oxygen has weak tendency to donate electrons in the reduced form has positive E’0.