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Bioinorganic Chemistry ( CH-486 ) – 2013


Department of Chemistry
University of Dhaka
4th Year B.S. (Honor’s) Examination, 2013
Course: Bioinorganic Chemistry, No. CH 486 (2 Credit Hours)
Full Marks: 35
Time: 2.5 hours

Answer question number 1 and any three from the remaining questions.

1. Give short answer of the following: – 1 x8
(a) What is Wilson’s.disease? How is it caused?
(b) What do you mean by HiPIP?
(c) What is soret band?
(d) How can you differentiate nitrification from denitrification?
(e) What are the special features of Zn2+ that make it an excellent biocatalyst?
(f) What is zinc finger?
(g) What is toxicity? How are the toxic elements entering into the body?
(h) What do you mean by superoxide dismutase (SOD)?

2.
(a) Discuss the mechanism of nitrogenases that reduce N2 to NH3. -3
(b) Discuss the functions involved in photosynthesis in the green plant. 5
(c) What is chlorophyll a? -1

3.
(a) What do you understand by the term biomineralization? How is it useful? 2
(b) Discuss the function of calcium in biological systems. 3
(c) Explain Na+ / K+ ion pumping mechanism across the cell membrane. 4

4.
(a) Name two globular oxygen binding proteins? Discuss their role. 1+2
(b) – Discuss the mechanism of oxygen transportation by hemoglobin. 4
(c) Write the structural differences between porphyrin ring and corrin ring. 2

5.
(a) What is iron-sulphur protein? Discuss its structure. 1+3
(b) Discuss the role of iron-sulphur protein in nitrogen fixation of biological system. 4
(c) What are metalloenzymes? – 1

6.
(a) What is vitamin B12? How do vitamin B12, vitamin B12r, and vitamin B12s, differ? 1+2
(b) Discuss the activity of vitamin B12 in the human body system. 3
(c) How can you differentiate nucleobase, nucleoside and nucleotide? 3


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