NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
JANUARY 2018 EXAMINATION

PROGRAMME

COURSE CODE:           BIO 303

COURSE TITLE:          GENERAL CYTOLOGY

CREDIT UNIT:              3

TIME ALLOWED:       2HOURS

TOTAL MARKS:          70%

INSTRUCTION:  ANSWER FOUR QUESTIONS  IN ALL BUT QUESTION  ONE  IS COMPULSORY

1a. Define the term Radioisotopes? 2marks

b. List three methods of detecting Radioisotopes? 6marks

c. List two advantages and three disadvantages of Autoradiography.5marks

d. List two types of electron microscopes. 4marks

e. Describe three autoradiography methods 3marks

f. state the principle of electron microscope 5marks

25marks

2a. What is Numerical Variation? 5marks

b. List three types of Chromosomal  and two types of Numerical variations. 5marks

c. what are karyotypes and their basic characteristics? 5marks

15marks

3a. Mention five general cytogenetic procedures and their roles. 5marks

b.   List five applications of cytogenetics.  10marks

  15marks

4a. State five molecular composition of the cell. 5marks

b. Describe briefly the different structural levels of proteins. 10marks

 15marks

5a. Describe five stages in mitosis. 10marks

b. list five stages of growth and differentiation of embryonic cells. 5marks

15marks