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: 1525

#Unit 4. Cell Communication and Cell Signaling

Following statements are regarding to chromatin remodelling factors SWI/SNF complexes. Which one of them is incorrect?

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#Question id: 3706

#Unit 3. Fundamental Processes

During the elongation stage of DNA replication

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#Question id: 27105

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following is examples of  β barrel structure

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#Question id: 4132

#Unit 3. Fundamental Processes

In E. coli, aminoacyl-tRNA synthetases:

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#Question id: 11337

#Unit 10. Ecological Principles

In which of the following biomes would we expect to find permafrost?