Question

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53. Dinitrophenol (DNP) is a molecule that can transport protons across the inner mitochondrial membrane, cyanide prevents the reduction of O, by the cytochrome Coxidase complex Which of the two will inhibit the oxidation of reduced co m es Explain 1.5 points c LOR o ndanom (c the Cyanide job being to prevent the reduction Oh my so it un tote connor of the relucrat b. Which of them is an uncoupling agent? Explain 1.5 points Clanice prevents the roolucnon so Dinitrophenol c. Which of them will potentially cause an increase in body temperature? Explain 2 points Divinophenol benny that its job is to transport protons through the loody, it will beusing a system 54. Indicate how cyclic photophosphorylation differs from noncyclic photophosphorylation in the following aspects (1 point each): a. Types of photosystems involved: b. Pattern of electrons flow: c. Type of energy produced: d. Type of energy used: c. Water splitting:

Answer 1

a. In cyclic phosphorylation only Photosystem 1 is invoved. In Non cyclic phosphorylation Photosystem 1 and 2 are involved.

b. Cyclic phosphorylation - electron travel in cyclic manner.

​​​​​​    Non cyclic phosphorylation- electron travel in non cyclic manner or in linear manner.

c. ATP are produced in cyclic phosphorylation and NADPH and ATP are produced in Non cyclic phosphorylation.

d. Sunlight is used as energy in cyclic phosphorylation.
  Energy from excited electrons provided by photosystem 2 is used in non cyclic phosphorylation.

e. In non cyclic phosphorylation the electrons combine with the protons – H+ which is produced by splitting up of the water molecule and reduces NADP to NADPH2.

Protolysis of Water is not required in cyclic phosphorylation.