Question

Which of the following steps during electron transfer in anoxygenic photosynthesis is
the ATP production step?
(A) Ferredoxin to Ubiquinone
(B) Ubiquinone to Cytochrome b
(C) Cytochrome b to Cytochrome f
(D) Cytochromef to excited bacteriochlorophyll​

Answer 1

Answer:

b is the answer

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Answer 2

The step, during electron transfer in anoxygenic photosynthesis, of the ATP production is (D) Cytochromef to excited bacteriochlorophyll​

Definition of Photosynthesis:

It is the process by which green plants utilize inorganic materials like, carbon dioxide, water, minerals and produce an organic food molecule in the presence of sunlight.

Photosynthesis - its types

• Depending on the availability of oxygen, photosynthesis is oxygenic and anoxygenic. In oxygenic photosynthesis evolution of oxygen through the splitting of water takes place. This mostly occurs in plants.
• When no oxygen is available, the process is called anoxygenic. It occurs in plants and as well as bacteria. here the reaction center is P680 in plants and P870 in bacteria, containing bacteriochlorophyll.
• The ATP generation in this cyclic phosphorylation takes place when the electron being transferred returns back to the bacteriochlorophyll in the reaction center from the Cytf or the cytochrome f.

Hence in anoxygenic photosynthesis, the ATP production takes place in cyclic phosphorylation, where there is no evolution of complex and energy is yielded when an electron is transferred from Cytf to P870.