NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
JUNE/JULY 2013 EXAMINATION

COURSE CODE:                                                                              BIO303

COURSE TITLE:                                                                             General Cytology

DURATION:                                                                                     2 Hours

INSTRUCTIONS:                                                                            Answer any 4 questions

Q1.a.    (i)        Mention the two major phase of cell cycle.

(ii)       Name the five stages of mitosis.

(iii)      Define the word “Embryology”.

      b.   Mention the stages of embryogenesis.

      c.    Explain briefly, the word “Diakinesis.

Q2.a     State the function(s) of the following parts of a Light Microscope:

(i)        Eye piece        (ii)       Body tube     (iii)      Objectives      

(iv)      Diaphragm    (v)       Stage

      b.   State the advantages of a Phase Contrast Microscope.

      c.    Define Darkfield Microscopy.

Q3a.     Define the following terms:

(i)        Cytogenetics  (ii)       Cytology         (iii)      Genetics

      b.   (i)        Mention the different types of Structural Chromosomal Variations.

(ii)       Define each of the mentioned structural Chromosomal Variations.

(iii)      What is Numerical Chromosomal Variation?

Q4.a     Mention the general cytogenetic procedures synonymous to all cytogenetic techniques.

      b.   (i)        Define Karyotype.

      (ii)       After Karyotyping, mention the observable characteristics in the chromosomes.

      c.    Outline the importance and applications of cytogenetics.

Q5.a    Mention the molecular composition of a cell.

        b.             State the functions/importance of protein in a living cell.

        c. Mention the different types of Nucleic acids.

d.  Outline the roles of the different types of nucleic acids. 

 Q6.a    Three (3) major control checkpoints exist during the course of eukaryotic cell cycle.

       b. Mention these checkpoints. Explain any one of these checkpoints.

        c. Make a concise comparism between RNA and Proteins.