BC/I/01 Student's Copy
2 0 1 8
Pre-CBCS
1st Semester
BIOCHEMISTRY
FIRST PAPER
Basic Biochemistry
Full Marks 55
Time 2½ hours
PART A—OBJECTIVE
Marks 20
The figures in the margin indicate full marks for the questions
SECTION—A
Marks 5
Tick the correct answer in the brackets provided 1×5=5
1. Which of the following is a reducing sugar?
Sucrose
Trehalose
Isomaltose
Agar
/192 1 Contd.
2. All proteins contain
same 20 amino acids
different amino acids
300 amino acids occurring in nature
only a few amino acids
3. Lipids are stored in the body mainly in the form of
phospholipids
glycolipids
triglycerides
fatty acids
4. Enzymes catalyzing electron transport are present mainly in the
ribosomes
nucleus
lysosomes
inner mitochondrial membrane
5. Which of the following techniques makes use of the difference in net
charges of proteins at a given pH?
Thin-layer chromatography
Ion-exchange chromatography
High performance liquid chromatography
Paper chromatography
BC/I/01/192 2 Contd.
SECTION—B
Marks 15
Write short notes on the following 3×5=15
1. Buffers
2. Peptide bond
3. Biological functions of lipids
4. Prokaryotic cells
5. Principle of centrifugation
PART B—DESCRIPTIVE
Marks 35
The figures in the margin indicate full marks for the questions
1. What are carbohydrates? Explain in detail the biological importance of
carbohydrates. Add a note on monosaccharides.
OR
Write brief notes on the following 3½+3½=7
Enthalpy
Second law of thermodynamics
2. What are amino acids? How are they classified?
OR
Write brief notes on the following 3½+3½=7
Forces stabilizing protein structure
Primary structure of protein
BC/I/01/192 3 Contd.
3. What are lipids? Explain the important functions of phospholipids.
OR
Write brief notes on the following 3½+3½=7
Simple lipids
Essential fatty acids
4. Discuss in brief the different membrane transport systems in animal cell. 7
OR
Write brief notes on the following 3½+3½=7
Nucleotides
DNA structure
5. Discuss the principle and applications of paper chromatography. 3½+3½=7
OR
Write brief notes on the following 3½+3½=7
Applications of pH meter
Principle of photometry