VM 132 UE Feb 2022

SOKOINE UNIVERSITY OF AGRICULTURE

COLLEGE OF VETERINARY MEDICINE AND BIOMEDICAL SCIENCES

UNIVERSITY EXAMINATION FOR 1ST YEAR BSc ANIMAL SCIENCE

 

DATE: 18 FEBRUARY 2022

TIME: 11:45 – 14:45 HRS

INSTRUCTIONS: ATTEMPT ALL QUESTIONS
Use well labeled diagrams where necessary

VENUE: MULTIPURPOSE

 

QUESTION ONE

1. A) Define the following terminology used in bacteriology; (10 marks)
a) Chemoheterotroph’s bacteria
b) Culture media
c) Bacteria enumeration
d) Antibiotic resistance
e) Toxigenesis

1. B) Complete the following sentences with a correct bacteriological word or terminology to make it meaningful (10 marks)

a) The Clostridium tetani toxin which causes lysis of red blood cells is known as…………….
b) A type of stain where by only a single dye is used is known as………………………
c) The process of determining the susceptibility of the bacteria to antibiotics is called…………
d) The ability of the microorganism to enter a host and cause disease is termed as……………
e) The E. coli strain which produces diarrhea in all animal spp including human is termed as ….

QUESTION TWO

2. A) Give the name of the bacteria species responsible for each of the following disease in cattle; (10 marks)
a) Pneumonia
b) Anthrax
c) Mastitis
d) Botulism
e) Bovine tuberculosis
2. B) By using definitions differentiate the following bacteriological words of terminologies (10 marks)
a) Infection against pathogenicity
b) Endotoxins against exotoxins
c) Uropathogenic E. coli against entero-invasive E. coli
d) Sterilization against disinfection
e) Exponential growth phase against Stationary growth phase

QUESTION THREE
With relevant examples explain types of culture media used in bacteriology (20 marks)

QUESTION FOUR
a) With the aid of well labelled diagrams, state one main difference between a naked and an enveloped animal virus (6 marks)
b) Provide one function of the following components of a virus; (i) capsid, (ii) nucleic acid, (iii) envelope, (iv) spike/ligand (4 marks)
c) Describe how the following groups of viruses enter and leave the cell
i) enveloped viruses (5 marks)
ii) naked viruses (5 marks)

QUESTION FIVE
Part One:
Write TRUE for correct statement or FALSE for incorrect statement (10 Marks)

(a) Yeast grows as single-celled organism forming a network called mycelium.
(b) All fungi require organic nutrients and they can grow as parasite, symbiont or saprotroph.
(c) Zoospores are thick-walled resting spores of fungi produced to survive unfavorable conditions.
(d) Mycotoxins are toxic compounds produced naturally by moulds, yeasts and mushrooms.
(e) Budding and binary fission are sexual method of reproduction in yeasts.
(f) Mycelium of Rhizopus spp. is made up of septate hyphae.
(g) Schizosaccharomyces pombe is an example of the yeast which replicate by budding.
(h) Rhizopus stolonifer lack Mitochondria but instead contain hydrogenosomes.
(i) To prevent contamination of fungal culture medium by bacteria, Cycloheximide is commonly included.
(j) Dimorphic fungi like Histoplasma capsulatum grows slowly and produce visible colonies in 1–4 weeks.

 

Part Two:

Matching items in Column A with their MOST corresponding ones in Column B (10 Marks)

Column A	Column B
i.   Saccharomyces cerevisiae	A.      Live as both yeasts and filamentous form B.      Fusion of two haploid cells to form diploid nucleus
ii.   Teleomorph	C.      A fruit body of Agaricus where basidia are produced
iii.   Pseudohyphae	D.      Fungi that lack a known sexual stage
iv.   Karyogamy	E.       Anaerobic organisms, lives in digestive tract of ruminants
v.   Coenocytic	F.       A vegetative body of a fungus
vi.   Woronin bodies	G.      Is an edible mushroom
vii.   Dimorphic fungi	H.      Oval-shaped cells and replicate by budding
viii.   Gills ix.   Fungi imperfecti	I.        Sexual stage (form) of a fungus J.        An incomplete budding, cells elongate but remain attached after division
x.   Neocallistigomycota	K.      Hyphae without septa (cross walls)
	L.       A unique character of Ascomycetes

 

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