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TLS Online TPP Program

#Question id: 603

Nonclassical competitive inhibition involves ________.

#Section 2: General Biology

  1. binding of the substrate at both the active site and at the inhibitor site

  2. binding of either the substrate to the active site or the inhibitor to its own binding site thus preventing the other from binding

  3. binding of the inhibitor to the substrate followed by binding of this complex to the active site

  4. chemical removal of the substrate from the active site by reaction with the inhibitor

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TLS Online TPP Program

#Question id: 10129

#Section 2: General Biology

Oxidation of water to form molecular oxygen is very difficult: The photosynthetic oxygen-evolving complex is the only known biochemical system that carries out this reaction which essential cofactor are involved in the water-oxidizing process?
TLS Online TPP Program

#Question id: 10131

#Section 2: General Biology

The detailed chemical mechanism of the oxidation of water to O2 is not yet well understood, but with structural information shows_one electron carrier, generally identified as Yz, functions between the oxygen-evolving complex and P680 to function in this region, Yz needs to have a very strong tendency to retain its electrons, this species has been identified as;
TLS Online TPP Program

#Question id: 10132

#Section 2: General Biology

Which of the following statements would be correct for photophosphorylation ?
TLS Online TPP Program

#Question id: 10133

#Section 2: General Biology

The PSI reaction center complex is a large multi-subunit complex in which the antenna chlorophylls are associated with the reaction center Components of the PSI reaction center are organized around as follows choose the incorrect one;
TLS Online TPP Program

#Question id: 10134

#Section 2: General Biology

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?
TLS Online TPP Program

#Question id: 10135

#Section 2: General Biology

Which of the following are strongest reductant?