National Open University Exam Past Question BIO 303 OCTOBER/November 2015

             National Open University of Nigeria

               14-16 Ahmadu Bello Way, Victoria Island Lagos 

                     School of science and technology

                 OCTOBER/November 2015 Examination 

        COURSE CODE: BIO 303

        COURSE TITTLE: GENERAL CYTOLOGY 

        TIME ALLOWED: 2hrs

        Instructions: ANSWER QUESTION 1 AND ANY OTHER THREE

1. a define  the following terms 

 i. cytogenetics         2marks

ii. Cytology                       2marks

iii. Genetics           2marks

bi. Mention the different types of structural chromosomal variations       4marks

ii. Define each of the mention chromosomal variations         4marks 

ci. What is a numerical chromosomal variation?                              5marks 

ii. Mention the different types of numeric chromosomal variations                       6marks

2 a. 3 major control check point exist during the course of eukaryotic cell cycle mention these check point 

Explain any one of these check points         5 marks

b. in a tabular form make a brief comparism between RNA and Proteins                          10marks

3.a. Mention the general cytogenetic procedures synonymous to all cytogenetic techniques                 4marks

bi. Define karyotypes                         2marks

ii. After karyotyping, mention the observable characteristics in the 

chromosomes               4marks

c. outline the importance and application of cytogenetics             5marks

4a. mention the molecular composition of a cell                      2 ½ marks

b. state the functions/importance of  proteins in a living  cell          2 ½ marks

c. mention the different type of    nucleic acids                    2 ½ marks

d. outline the roles of the different types of nucleic acids     71/₂ marks

5. i. mention the two phases of cell cycle                      3 marks

  ii. Name any three stages of mitosis           3marks

  iii. Define the word embryology                           2marks

iv. Mention the stages of embryogenesis             2 marks  

      

v. explain briefly the word diakinesis                      5marks

6.a. state the functions of the following part of a light microscope     5marks

 i. Eye piece

ii. Body tube

iii. Objective

iv. Diaphragm

v. stage

b. state the advantages of a phase contrast microscope         4marks

c. define dark field microscopy                      2marks

d. mention two advantages of an electron microscope                   4marks

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