The herbicide 3-(3,4-dichlorophenyl)-1,1-demethyl urea (DCMU) blocks photosynthe
ID: 169232 • Letter: T
Question
The herbicide 3-(3,4-dichlorophenyl)-1,1-demethyl urea (DCMU) blocks photosynthetic electron transport from PSII to the cytochrome bf complex. When DCMU is added to isolated chloroplasts, what will be the effect on A) O2 evolution B) ATP production And C) NADPH production? The herbicide 3-(3,4-dichlorophenyl)-1,1-demethyl urea (DCMU) blocks photosynthetic electron transport from PSII to the cytochrome bf complex. When DCMU is added to isolated chloroplasts, what will be the effect on A) O2 evolution B) ATP production And C) NADPH production? A) O2 evolution B) ATP production And C) NADPH production?Explanation / Answer
A) oxygen evolution will stop when DCMU is added to isolated chloroplast because PII in the P680 state is not reoxidized .
B) when DCMU is added to isolated chloroplast initially ATP production is not affected because cyclic electron flow continues.But after some time ATP production will cease because of absence of ADP and Pi, which act as reactants.
C) When DCMU is added to isolated chloroplast NADPH production is stopped as there is no release of electrons.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.