Biomembranes And Sub-Cellurar Organelles Question Paper

Biomembranes And Sub-Cellurar Organelles

Course:Bachelor Of Science (Biomedical Science & Technology)

Institution: Kenyatta University question papers

Exam Year:2009

KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2009/2010
FIRST SEMESTER EXAMINATION FOR THE DEGREE OF
BACHELOR OF SCIENCE(BIOCHEMISTRY AND BIOTECHNOLOGY)
SBC 203: BIOMEMBRANES AND SUB-CELLURAR ORGANELLES
DATE: Tuesday 29th December 2009 TIME: 8.00am – 10.00am
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Instructions: Section A: Answer any two questions (20 marks each)

1.a)Explain how biomembranes determine the composition of the space they
enclose. [5marks]
b) Explain the chemical compositions of biomebranes. [5marks]
c) Define membrane symmetry and explain how it is maintained.[10marks]

2. a) What are the major purposes of active transport in the mammalian body?[4marks]
b) Explain the mechanism of the sodium pump in the plasma membrane.[8marks]
c) Explain the two characteristics of membrane transport systems.[8marks]

3. a) Describe the electron transfer methods in the transport chain of the
mitochondria. [10marks]
b) Illustrate the formula used to calculate the Free Energy Changes
accompanying electron transport. [4marks]
c) Calculate the amount of energy released when electrons transverse the
whole mitochondria electrons transport chain if the redox potential of
NAD/MADH couple = -0.32v and oxygen/water couple = +0.82v. and
account for all energy released. [6marks]

Section B: Answer all questions (10marks)

4. a) Giving specific examples, discuss the inhibitors of electrons transport.
b) How does NADH dehydrogenate transfer electrons?

5. Explain how materials are transported across the nuclear envelope.

6. Describe the structure and function of ribosomes.

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