Some herbicides such as dichlorophenyldimethylurea (DCMU, also known as diuron) and paraquat, block photosynthetic electron flow from where ?

a.) DCMU blocks electron flow at the quinone acceptors of PSII, by competing for the binding site of plastoquinone that is normally occupied by PQB

b.) Paraquat accepts electrons from the early acceptors of PSI and then reacts with oxygen to form superoxide, O2 – , a species that is very damaging to chloroplast components

c.) DCMU blocks electron flow at the pheophytin acceptors of PSII, by competing for the binding site of pheophytin

d.) Paraquat accepts electrons from the Iron-sulfur system of PSI and then reacts with oxygen to form superoxide, O2 – , a species that is very damaging to chloroplast components

Which of the following combination is true?

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#Question id: 790

#Unit 1. Molecules and their Interaction Relevant to Biology

Presence of a series of 3 G-C pairs in the anticodon arm of initiator fmet tRNA is essential for

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#Question id: 9224

#Unit 9. Diversity of Life Forms

Which of the following strategies would most rapidly increase the genetic diversity of a population in an extinction vortex?

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#Question id: 20846

#Unit 12. Applied Biology

Nitrate is energetically the best electron acceptor under anoxic conditions and is generally used preferentially by which type of microbes?

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#Question id: 23386

#General Aptitude

BXJ, ET L, HP N, KLP, .....

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#Question id: 5471

#Unit 8. Inheritance Biology

A plant height in Maize is control by 3 pair of polygene. Two varieties of maize averaging 120 and 90 inches in height, respectively, are crossed. The F1 progeny is quite uniform averaging 105 inches in height. What will be height phenotype of F2 progenies ?