NATIONAL OPEN UNIVERSITY OF NIGERIA

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

COURSE CODE:      BIO303

COURSE TITLE:     GENERAL CYTOLOGY

CREDIT UNIT:         2

TIME ALLOWED:   2HOURS

TOTAL MARKS:     70%

INSTRUCTION:       ANSWER QUESTION ONE (COMPULSORY) AND ANY OTHER THREE QUESTIONS

1a. Explain the term Resolution of a light microscope 9marks

b. Mention two types of electron microscope. 2marks

c. Enumerate two advantages and five disadvantages of electron microscope. 14marks

                                                                                                                                    (25marks)

2a. The table below shows some of the historical events that occurred in the advancement of cell biology. Complete the table by stating the events of the contributions of the respective scientists (5marks):  

2b. i. What is Karyotyping? (5marks)

ii. State five characteristics observed in the chromosome, after karyotyping (5marks)

3a. List three types of Carbohydrates (3marks)

b. Define each of these carbohydrate types (3marks)

c. Compare between Starch and Glycogen (9marks)

4a. What do you understand by Nucleic acid? (11marks)

b. List the four structural levels of proteins (4marks)

5. Describe the following phases of eukaryotic cell cycle:

a. Gap 1 Phase; (5marks)

b. S phase; (5marks) and

c. Gap 2 phase (5marks)