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Chapter 19: Q11CP (page 651)

What chloroplast protein is the functional counterpart of mitochondrial cytochrome c?

Short Answer

Expert verified

Cytochrome b6fof chloroplast is the functional counterpart of mitochondrial cytochrome c.

Step by step solution

01

Introduction to cytochrome  c

Cytochromecis a hem protein that transmits electrons between complex III and complex IV of the respiratory chain. It is found in the compartment between the inner and outer mitochondrial membranes.

02

The functional counterpart of mitochondrial cytochrome c

Mitochondrial proteins are important in mitochondrial function, including electron transport chain reactions.

The cytochrome cpresent in the mitochondrial membrane and cytochromecomplex present in the thylakoid membrane (chloroplast) have sequence homology and structural similarities.

In the photosynthesis process, the cytochrome b6f complex is involved in electron transport via the membranes of the thylakoids.

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Most popular questions from this chapter

Explain the relationship between the light and dark reactions.

Predict the effect of adding myxothiazol, an inhibitor of electron transport in mitochondrial Complex III, to a suspension of chloroplasts exposed to light. Would either ATPorNADPH production be affected?

Chloroplasts are illuminated until the levels of the Calvin cycle intermediates reach a steady state. The light is then turned off. How does the level of RuBP vary after this point?

The net equation for oxidative phosphorylation can be written as

2NADH + 2H+ + O2 鈫� 2H2O + 2NAD+

Write an analogous equation for the light reactions of photosynthesis.

For the chloroplasts described in Problem 23, how does the level of 3PG vary after the light is turned off?
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