W1-2-60-1-6
JOMO KENYATTA UNIVERSITY OF AGRICULTURE AND TECHNOLOGY
University Examinations 2020/2021
YEAR I SEMESTER I EXAMINATION FOR THE DEGREE OF BACHELOR OF SCIENCE/APPLIED BIOENGINEERING/INDUSTRIAL BIOTECHNOLOGY/APPLIED BIOLOGY 

SBT 2103:  CELLULAR BASIS OF LIFE  

DATE:   JANUARY, 2021				        		    TIME:  2 HOURS

INSTRUCTIONS:  	 Answer Question ONE and Any Other TWO Questions.

Question One – 30 Marks 

a)	i.	Highlight the possible causes of a blurred and unfocussed image seen under a 	light microscope.	[4 marks]

	ii.	Enumerate four structural and/or functional differences between a light 	microscope and an electron microscope.	[4 marks]

b)	Briefly describe modern tenets of the cell theory.	[6 marks]

c)	Highlight factors that limit the size of cells.	[2 marks]

d)	Describe three types of specialized cells in an animal body.		[3 marks]

e)	Outline the functions of lysosomes in an animal cells.	[2 marks]

f)	Enumerate five similarities between chloroplasts and mitochondria.	[5 marks]

g)	Classify chromosomes on the basis of location of the centromere.	[4 marks]

Question Two – 20 Marks

Discuss the common origin of cellular life as elucidated by the biochemical evolution theory.	
[20 marks]

Question Three – 20 Marks

Citing specific examples, discuss functional groups that contribute to the molecular diversity of 
life.	[20 marks]

Question Four – 20 Marks

Discuss the non-cellular life forms.	[20 marks]