No. of Printed Pages: 6 ILSE-Oll
BACHELOR OF SCIENCE (B.Sc.)
Term-End Examination
December, 2016

LJ4754
LIFE SCIENCE LSE-O1 CELL BIOLOGY
Time 2 hours Maximum Marks: 50
Note: Question no. 1 is compulsory. Attempt any four questions from questions no. 2 to 7. Draw well labelled diagrams wherever necessary.

1. Name any five of the following: 5x1=5

Organelle common to both prokaryotes and eukary9tes.

Major protein components of myofibril.

Enzyme that synthesizes cAMP.

Short segments of replicating DNA of lagging strand.

Most common protein associated with eukaryotic DNA

Organelle capable of. digesting other cellular organelles.

Fill in the blanks with appropriate words: 5x1=5

is the technique that separates molecules on the basis of charge on them.

is the site of ATP production in mitochondria.

Secretions of endocrine glands are called

Clone is a population of cells derived from a cell.

is the example of a disaccharide.


2. Write short notes on any two of the following: 2x5=10

Cyclic-AMP as second messenger.

Endosymbiotic origin of mitochondria and chloroplast.

Fluid mosaic model of cell membrane.

3. With the help of suitable diagrams, explain the semi-conservative model of DNA replication. 4+6=10

4. Classify enzymes according to IUB system, giving one example of each category. 3

What are hormones? How do hormones regulate the metabolic activities of the cell

5. Describe the process of transcription in prokaryotes. How does it differ from that in eukaryotes 7+3=10

6. Describe the different stages of prophase-I of meiosis with the help of diagrams. 6

What is the significance of meiosis 2

List four main differences between mitosis and meiosis. 2

7. Differentiate between the following 5x2=10

DNA and RNA

Coenzyme and Prosthetic group

Competitive and Non-competitive enzyme inhibitors

Skeletal muscle and Cardiac muscle

Oxidative phosphorylation and Photophosphorylation