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National Open University Exam Past Question – BIO 303 OCTOBER/NOVEMBER 2014 EXAMINATION

NATIONAL OPEN UNIVERSITY OF NIGERIA BIO 303 GENERAL CYTOLOGY

14-16 AHMADU BELLO WAY, VICTORIA ISLAND LAGOS SCHOOL OF SCIENCE AND TECHNOLOGY OCTOBER/NOVEMBER 2014 EXAMINATION

 

 

COURSE TITLE: GENERAL CYTOLOGY

COURSE CODE: BIO 303

TIME ALLOWED: 2 HOURS

 

 

INSTRUCTION: ANSWER QUESTION 1 AND ANY OTHER THREE QUESTIONS

 

 

1.

  1. a) What is microscopy?(2 marks)
  2. b) What are the 2 basic differences between optical and electron microscopes. (2marks)
  3. c) Itemise and state the functions of the essential components of a

microscope.(5×2=10 marks)

  1. d) What significant feature of the microscope determines the magnification of the viewed specimen? (2marks)
  2. e) Differentiate between cell growth and differentiation(2marks)
  3. f) What are 3 unique components of fluorescence microscopy? (3marks)
  4. g) State and describe the 4 structural chromosomal variations (4marks)

(Total 25marks)

 

  1. a) Describe the general procedures employed in cytogenetic techniques (8 marks).
  2. b) Give an account of karyotyping (7 marks)

(Total 15 marks)

 

  1. Compare and  contrast  the  nature,  principles  and  functions,  stating  the

advantages and disadvantages of the phase contrast and dark field microscopes. (15 marks)

 

  1. Write precisely on the principles (5marks) and methods (10 marks) in autoradiography. (Total 15 marks)

 

  1. a) Describe the nature (3 marks), principles (1 marks) and uses (3 marks) of the electron microscopes.
  2. b) What are the advantages and disadvantages of the tool (8marks). (Total 15 marks)
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  1. Enumerate and describe the different phases of cell cycle. (15 marks)

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