The Cell And Its External Environment Question Paper

The Cell And Its External Environment

Course:Bachelor Of Science In Biology

Institution: Kenyatta University question papers

Exam Year:2009

KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2009/2010
FIRST SEMESTER EXAMINATION FOR THE DEGREE OF BACHELOR OF
SCIENCE IN BIOCHEMISTRY/BIOTECHNOLOGY/MOLECULAR
BIOLOGY/FORENSIC SCIENCE

SBC 101: THE CELL AND ITS EXTERNAL ENVIRONMENT

DATE: Tuesday 22nd December, 2009
TIME: 2.00 p.m – 4.00 p.m
------------------------------------------------------------------------------------------------------------
INSTRUCTIONS:
Section A: Answer ANY TWO Questions (20 marks each)
Q1.
a)
Discuss the functional ultrastructure of the following cellular
components.

(12
marks)
i)
End spores
ii)
Mitochondria
iii)
Plastids
b)
Discuss the activities that occur in the first phase of meiosis (7 marks)
Q2.
a)
Give a detailed description of the cytoplasmic membrane. (7 marks)

b)
Discuss the cell cycle and explain how it can be regulated. (9 marks)

c)
Describe the structure of the murein layer of a prokaryotic cell. (4 marks)
Q3.
a)
Describe the composition of the blood and explain the role of each
component.

(8
marks)

b)
Giving example where possible, describe the features of the major

cytoskeleton filaments found in Eukaryotic cells.

( 8 marks)

c)
Outline the functional ultrastructure of the Golgi apparatus and explain

how it regulates the insertion of membrane proteins.
( 4 marks)

Page 1 of 2

Section B Answer ALL questions (10 marks)

Q4. a) Discuss
the
functional ultrastructure of lysosomes and explain how they
differ
from
perosisomes.
(
7
marks)

b)
State six differences between mitosis and meiosis.
(3 marks)
Q5. a)
Write
short notes on the:
a)
bacterial
flagella
and
explain
how it mediates motility (6 marks)

b)
The nucleus and nucleoid

( 6 marks)
Q6. a)
Describe
the
? -glutamyl cycle in kidney cells

(8 marks)

b)
Outline the significance of fimbriae in prokaryotes
(2 marks)

Page 2 of 2

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