Carbonyl cyanide m-chlorophenyl hydrazone (CCCP) is an ionophore that allows the free passage of protons through membranes and is a metabolic poison of mitochondria. A researcher tested CCCP on the green alga Hydrodictyon africanum. Results showed that CO2CO2 fixation was severely inhibited, whereas O2O2 release and production of NADPH were only mildly affected. What is the MOST likely explanation of the results for the inhibition of carbon fixation?   A. CCCP disrupts the synthesis of ATP at the mitochondrial membrane.   B. CCCP inhibits splitting of water at the thylakoid membrane.   C. CCCP inhibits the flow of electrons at the mitochondrial membrane.   D. CCCP disrupts the synthesis of ATP at the thylakoid membrane.

Biochemistry
6th Edition
ISBN:9781305577206
Author:Reginald H. Garrett, Charles M. Grisham
Publisher:Reginald H. Garrett, Charles M. Grisham
Chapter21: Photosynthesis
Section: Chapter Questions
Problem 5P: The Relative Efficiency of ATP Synthesis in Noncyclic versus Cyclic Photophosphorylation If...
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Carbonyl cyanide m-chlorophenyl hydrazone (CCCP) is an ionophore that allows the free passage of protons through membranes and is a metabolic poison of mitochondria. A researcher tested CCCP on the green alga Hydrodictyon africanum. Results showed that CO2CO2 fixation was severely inhibited, whereas O2O2 release and production of NADPH were only mildly affected. What is the MOST likely explanation of the results for the inhibition of carbon fixation?

  •  
    A.

    CCCP disrupts the synthesis of ATP at the mitochondrial membrane.

  •  
    B.

    CCCP inhibits splitting of water at the thylakoid membrane.

  •  
    C.

    CCCP inhibits the flow of electrons at the mitochondrial membrane.

  •  
    D.

    CCCP disrupts the synthesis of ATP at the thylakoid membrane.

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