The substance dichlorophenyldimethylurea (DCMU) is an herbicide thatinhibits photosynthesis by blocking electron transfer between plastoquinones in photosystem II.(a) Would you expect DCMU to interfere with cyclic photophosphorylation?(b) Normally, DCMU blocks O2 evolution, but addition of ferricyanide to chloroplasts allows O2 evolution in the presence of DCMU. Explain.

The substance dichlorophenyldimethylurea (DCMU) is an herbicide thatinhibits photosynthesis by blocking electron transfer between plastoquinones in photosystem II.(a) Would you expect DCMU to interfere with cyclic photophosphorylation?(b) Normally, DCMU blocks O2 evolution, but addition of ferricyanide to chloroplasts allows O2 evolution in the presence of DCMU. Explain.

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

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ISBN:9781305967359

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Chapter20: The Protists

Section: Chapter Questions

Problem 4CT: Melvin Calvin and Andrew Benson determined the steps in the light-independent reactions of...

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The substance dichlorophenyldimethylurea (DCMU) is an herbicide that
inhibits photosynthesis by blocking electron transfer between plastoquinones in photosystem II.(a) Would you expect DCMU to interfere with cyclic photophosphorylation?(b) Normally, DCMU blocks O₂ evolution, but addition of ferricyanide to chloroplasts allows O₂ evolution in the presence of DCMU. Explain.

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The substance dichlorophenyldimethylurea (DCMU) is an herbicide thatinhibits photosynthesis by blocking electron transfer between plastoquinonesin photosystem II.(a) Would you expect DCMU to interfere with cyclic photophosphorylation?(b) Normally, DCMU blocks O2 evolution, but addition of ferricyanide tochloroplasts allows O2 evolution in the presence of DCMU. Explain.
The substance dichlorophenyldimethylurea (DCMU) is an herbi- cide that inhibits photosynthesis by blocking electron transfer between plastoquinones in photosystem II. (a) Would you expect DCMU to interfere with cyclic photophos- phorylation? (b) Normally, DCMU blocks Oz evolution, but addition of ferri- cyanide to chloroplasts allows Oz evolution in the presence of DCMU. Explain.
The substance dichlorophenyldimethylurea (DCMU) is an herbicide that in- hibits photosynthesis by blocking electron transfer between plastoquinones in photosystem II. (a) Would you expect DCMU to interfere with cyclic photophosphorylation? (b) Normally, DCMU blocks Oz evolution, but addition of ferricyanide to chloroplasts allows O, evolution in the presence of DCMU. Explain.
1) Dichlorophenyldimethylurea inhibits photosynthesis by blocking electron transfer between the plastoquinone in photosystem II. a) Would you expect this to interfere with cyclic photophosphorylation? b) This herbicide normally stops O2 evolution, but if we add ferricyanide to the chloroplasts, O2 evolution continues. Why might this be the case?
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