#Question id: 10134
#Unit 6. System Physiology – Plant
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?
#Question id: 10135
#Unit 6. System Physiology – Plant
Which of the following are strongest reductant?
#Question id: 10136
#Unit 6. System Physiology – Plant
A protein complex contain a Rieske protein known as
#Question id: 10137
#Unit 6. System Physiology – Plant
The Calvin–Benson cycle pathway decreases the oxidation state of carbon from the highest value, found in CO2 (+4), to levels found in sugars; +2 in keto groups — CO—; 0 in secondary alcohols —CHOH, In view of its notable capacity for lowering the carbon oxidation state, the Calvin–Benson cycle is also aptly named the
#Question id: 10138
#Unit 6. System Physiology – Plant
The Calvin–Benson cycle proceeds in three phases that are highly coordinated in the chloroplast these three phases namely--Carboxylation, Reduction and Regeneration. The following statements are not related to the three phases of Calvin–Benson cycle:
#Question id: 10139
#Unit 6. System Physiology – Plant