SOKOINE UNIVERSITY OF AGRICULTURE
COLLEGE OF VETERINARY MEDICINE AND BIOMEDICAL SCIENCES
PROBATION/FIRST SITTING EXAMINATION FOR 1ST YEAR BSc ANIMAL SCIENCE
DATE:
TIME:
INSTRUCTIONS: ATTEMPT ALL QUESTIONS
Use well labeled diagrams where necessary
VENUE:
QUESTION ONE
1. A) List the requirements necessary for bacteria growth (3marks)
1. B) State the role of each requirement named above on bacteria growth (3marks)
1. C) Using a well-labeled sketch, explain the phases of bacteria growth (10marks)
QUESTION TWO
2. A) The graph below (fig 1) depicts one of the factors affecting bacteria growth, read the graph and answer the questions below.
Fig 1.
Questions
i) Name the factor affecting bacteria growth depicted on the graph above. (2marks)
ii) Describe the graph in relation to bacteria growth. (8marks)
iii) Classify bacteria based on the factor named in (i) above (4marks)
2.B) You are given a picture below which shows one of the bacteria enumeration methods used in microbiology, have a look and respond to the questions below.
i) Give the name of the enumeration method depicted above. (1mark)
ii) Name the process-taking place along I to V. (1mark)
iii) Which bacteria culture plate will be suitable for cell count calculation (specify plate number)? why (3marks)
iv) Calculate the Colony Forming Unit (CFU/ml) of the sample (5marks). Note: Report your answer on scientific notation, Show all your calculations clearly
QUESTION THREE.
3.A) You are provided with terminologies used in microbiology and their meaning in the table below, Match the terms in column A with their corresponding meaning in Column B (5 marks)
| S/N | Column A | Column B |
| 1 | Antiseptic | A. possess coagulase enzyme that make them to test negative to coagulase test |
| 2 | sterilization | B. applied on animate surfaces |
| 3 | Filtration | C. destroy bacteria population alone |
| 4 | Staphylococcus aureus | D. remove microorganisms from solutions |
| 5 | Mycobacteria tuberculosis | E. 70% alcohol and V-RID |
| F. destroy all forms of life | ||
| G.can be controlled by pasteurization of milk | ||
| H. stain positive to gram and they are non spore forming |
3. B) List five (5) bacteria species associated with Pasteurized milk and milk products. ( (5 marks)
QUESTION FOUR
a) What are the three main hypotheses that try to explain the origins of viruses? (6 marks)
b) Describe how the different organelles/parts of the cell support the replication of viruses (14 marks)
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