ZOO/V/05 Student's Copy
2 0 1 8
Pre-CBCS
5th Semester
ZOOLOGY
FIFTH PAPER
Cell Biology
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. Nucleolus is absent in
plant cells
animal cells
prokaryotic cells
eukaryotic cells

2. Pinocytosis is the process of engulfing
semisolid particles
fluid particles
largesize sold particles
smallsize solid particles
3. The membranes of mitochondria are made of
glycolipid layers
phospholipid layers
cholesterol layers
sphingolipid layers
4. A region of repetitive nucleotide sequences at each end of the chromosome
is called
chromomere
chromonemata
telomere
chiasmata
5. Sarcomas are tumours in
connective tissue
germ cells
embryonic tissue
epithelial cells
SECTION—B
Marks 15
Write short notes on the following in not more than 5-8 sentences each
3×5=15
1. Cell theory
2. Lysosome
3. Intermediate filaments
4. Cell junctions
5. Crossing-over

PART B—DESCRIPTIVE
Marks 35
The figures in the margin indicate full marks for the questions
1. Give a brief account on tenets and limitations of cell theory. 7
OR
Discuss the active transport across the membrane with examples. 7
2. Write notes on endocytosis and phagocytosis. 3½+3½=7
OR
Describe the structure and functions of rough endoplasmic reticulum. 7
3. Explain the structure of microtubules.
7
OR
Describe the structure and functions of mitochondria.. 7
4. Define karyotype and discuss the concepts, components and importance of
karyotyping.
OR
Write notes on 3½+3½=7
Desmosomes
Adhesion
5. Explain in detail the regulation of cell cycle through cyclin CDK complexes. 7
OR
Define carcinogens. Write a note on the different types of carcinogens. 7