National Open University Exam Past Question BIO 303 OCTOBER 2014

                 

                                                         

                                                                     National Open University of Nigeria

                                                            14-16 Ahmadu Bello Way, Victoria Island Lagos 

                                                                    School of science and technology

                                                                      OCTOBER 2014 Examination

                  ^{COURSE CODE: BIO 303}

                  ^{COURSE TITTLE: GENERAL CYTOLOGY} 

                  ^{TIME ALLOWED: 2hrs}

                   ^{Instructions: ANSWER QUESTION 1 AND ANY OTHER 3}

^{1.  a. what is microscopy?                                                                                                                                                                                2 marks}

      ^{b. what are two basic differences between optical and electron microscope                                                                                                                                                          2 marks}

      ^{c. itemize and state the functions of the essential components of a microscope                                                                                                                                (5x2=10marks)}

     ^{d. what significant feature of the microscope determines the magnification of the viewed specimen ?                                                                                                                           2 marks}

    ^{e. differentiate between cell growth and differentiation                                                                                                                                                       2 marks}

    ^{f. what three unique  component of fluorescence microscopy                                                                                                                                     3 marks}

    ^{g. state and describe the first structural chromosomal variations                                                                                                                                                   4 marks}

   ^{2. a. describe the general procedures employed in cytogenetic techniques                                                                                                                                                                       8 marks}

       ^{b. give an account of karyotyping                                                                                                                                                                    7 marks}

   ^{3.  compare and contrast the nature, principles and functions, stating the advantages and disadvantages of the phase contrast}

     ^{And dark field microscopes                                                                                                                                                                                  15 marks}

^{4. Write precisely on the principles (5marks) and methods (10marks) in autoradiography, total                                                            (15marks)}

^{5.  a. describes the nature (3marks), principles (1marks) and uses 3marks of the electron microscopes.}       

     ^{b. what are the advantages and dis advantages of   the tool                                                                                                                         8 marks}

                                                                                  ^{total= 15 marks}

^{6. Enumerate and describe the different  phases of cell cycle                                                                                                                          15marks}

  

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