LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
M.Sc. DEGREE EXAMINATION – BIOTECHNOLOGY
FIRST SEMESTER – NOV 2006
AE 15
BT 1814 - BIOMOLECULES
(Also equivalent to BT 1806)
Date & Time : 28-10-2006/1.00-4.00
Dept. No.
PART - A
Answer all the questions
Choose the correct answer :
Max. : 100 Marks
(20 MARKS)
(5 x 1 = 5)
1.
Lactose is a disaccharide containing
a)  1, 4 linkage
b) glucose and galactose
c) two glucose units
d) glucose and fructose.
2.
An odd numbered fatty acid will enter the citric acid cycle at the start as
a) Citrate
b) Malate
c) Succinate
d) Isocitrate
3.
Prosthetic group in glycoproteins are composed of
a) lipids
b) metals
c) carbohydrates
4.
d) phosphates
An enzyme which joins the DNA molecule is called
a) DNA ligase b) DNA lyase
c) DNA polymerase d) Endonuclease
5.
Uric acid is
a) formed from xanthine in the presence of oxygen
b) degradation product of cytidine
c) a competitive inhibitor of xanthine oxidase
d) oxidized before it is excreted in urine, in humans.
II.
State true or false, if false state the reason :
(5 x 1 = 5)
6.
7.
8.
9.
10.
Glucose and fructoses are epimers .
Oleic acid is an essential fatty acid.
Active site occupies a relatively small portion of the enzyme molecule.
Peptide bond is the backbone of protein structure.
Nucleotides are the phosphoric acid esters of nucleosides.
III.
11.
12.
13.
14.
15.
Complete the following
(5 x 1 = 5)
The repeating unit in hyaluronic acid is _______
The non-protein part of holoenzyme is ________
Ribose and deoxy ribose differ in their structure around the carbon atom-------_______ fatty acid have double bonds at Δ 9, 12
Protein are polymers of _______
IV. Answer the following, each within 50 words :
16.
17.
18.
19.
20.
(5 x 1 = 5)
Define isoenzyme.
Write the structure of d TTP .
What is carnitine ?
Define the composition of inulin .
Define isoelectric pH.
PART - B
Answer any 5 questions each within in 350 words only
21.
22.
23.
24.
25.
26.
27.
28.
(5 x 8 = 40)
Describe the classification of fatty acid.
Give an account on Enzyme specificity.
Discuss the structure and types of lipoproteins.
Explain the structure of glycogen and cellulose.
Describe the degradation of purine bases.
Disucss the denaturation of proteins.
Write an account on various factors affecting enzyme activity.
Write the structure of a) heparin b) arginine c) plasmalogen d) chitin
PART - C
Answer each of the following, within 1500 words
29.
Describe the classification of proteins with suitable examples.
OR
Explain in detail the classification of lipids with structure.
30.
Ennumerate the steps envolved in the  oxidation of fatty acids.
OR
Describe the classification of carbohydrates with examples.
_______________
(2 x 20 = 40)