No. of Printed Pages: 8 ILSE-Oll
BACHELOR OF SCIENCE (B.Sc.)
Term-End Examination
June, 2016

06347
LIFE SCIENCE
LSE-O1 CELL BIOLOGY

Time hours Maximum Marks: 50
Note: Question no. 1 is compulsory. Attempt any four questions from questions no. 2 to 6. Draw well labelled diagrams wherever necessary.

1. Fill in the blanks with appropriate words 5x1=5

All cells arise from the pre-existing .

ATP molecules are produced when 2e move from FADH2 to oxygen.

is the donor of glucose to the glycogen-primer for the synthesis of glycogen.

Conversion of a fatty acid into is called gluconeogenesis.

The main structural component of plant cell-wall is .

Match the terms given under Column A with those given under Column B 5x1=5

ColumnA ColumnB

Callose Cytoskeleton

Histones blood

Microtubules Secondary messenger

Cyclic-AMP Sieve tubes

Thrombocytes Eukaryotic cells


2. Indicate whether the following statements are True or False. Give a brief reason to support your answer. (Attempt any five). 5x2=10

Mitosis is absent in prokaryotic cells.

H^3-thymidine is used to locate DNA in the cells.

Osmotic pressure of 1M sucrose is equal to the osmotic pressure of 1M NaCl.

One of the steps of glycolysis releases 2H, which combine with oxygen to form H2O.

NAD is the hydrogen acceptor in Pentose Phosphate Pathway.

Cells in animal tissues are held together by calcium pectate.

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

Exocytosis

Mitochondria

Replication of DNA

4. Describe the molecular organization and functions of the cell membrane. 5

Giving suitable diagrams, distinguish between Collenchyma and Sclerenchyma. 5

5. What is an enzyme Write a note on the mechanism of its action. 5

What are lysosomes What is the difference between primary and secondary lysosomes 5

6. Why is Prophase-I a lengthy phase as compared to Prophase-II during meiosis? What is the significance of meiosis 5

Draw a well labelled diagram of a typical bacterial cell. 5