LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PLANT BIOLOGY & PLANT BIO-TECH.

VE 11

FOURTH SEMESTER – April 2009

PB 4504 – MICROBIOLOGY

 

 

 

Date & Time: 24/04/2009 / 9:00 – 12:00  Dept. No.                                                Max. : 100 Marks

 

 

                                PART –A                                                    (20 marks)

 

1. Choose the correct answer (5×1=5)

 

1. The scientist Known as Father of Microbiology is

1. Louis Pasteur b. Alexander Fleming c. Robert Koch       d. Joseph Lister

 

1. The structure associated with conjugation by bacteria are

1. Pilus b. Flagella c. Mesosome         d. Cilia

 

1. The organisms which grow at 37 °C are called

1. Thermophiles b. Eosinophiles   c. Mesophiles   d. Psychrophiles

 

1. The bacteriphage capsid is usually made of

1. Lipid b. Protein c. Carbohydrate     d. Nucleic acid

 

1. The organism used in the lactic acid production is

1. Penicillium spp b. Aspergillus spp c. Lactobacillus spp   d. Bacillus spp

 

1. State whether the following statements are True or False (5×1=5)

 

1. Joseph Lister gave the world the first antiseptic – Carbolic acid .

 

1. Treponema palladium is a spiral thick and rigid.

 

1. Bacteriophages help in transduction.

 

1. Griffith experiment proves the process of conjugation.

 

1. Sewage pollution in drinking water is indicated by the presence of E.coli.

 

III. Complete the following                                                                      (5×1=5)

 

1. ____________  is an example of acid fast bacterium.

 

1. Log phase of growth is also known as ________________ phase.

 

1. _______________ pigment present in Sulpur bacteria  helps trap sunlight.

 

1. The expansion of BOD is ______________.

 

1. The viruses are cultivated using ______________.

 

 

 

 

IV Answer the following within 50 words                                       (5×1=5)

Write short notes on

 

1. Koch`s postulates

 

1.  Spread plate  technique

 

1. RUBISCO

 

1. Virion

 

1. VAM fungi

 

PART – B

Answer any FIVE of the following in about 350 words                       (5×8=40)

 

1. Write the principle and method of Gram Staining .
2. Explain ultra structure of bacteria.
3. Describe the light reactions of photosynthesis in bacteria.
4. Discuss whittakers  S Kingdom concept.
5. Explain the concept of lysogeny.
6. Elaborate on food spoilage caused by bacteria.
7. Describe the waste water treatment by aerobic means.
8. Write about the types of cuetue media based on physical state and chemical composition.

 

PART-C

Answer the following in about 1500 words                                          (2X20=40)

 

 

• Write in detail the process of recombination in bacteria.

OR

1. Describe different quantitative measurements used to Find bacterial growth.

 

30a. Explain the biogeochemical cycles present in bacteria.

OR

1. Discuss in detail the structure, types and classification of bacteriophages.

                                             

 

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