LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
B.Sc. DEGREE EXAMINATION – CHEMISTRY & ADV. ZOOLOGY
THIRD SEMESTER – NOVEMBER 2010
PB 3206 / 3200 – GENERAL MICROBIOLOGY
Date : 12-11-10 Dept. No. Max. : 100 Marks
Time : 9:00 – 12:00
PART A (20 marks)
Answer all questions.
- Choose the correct answer: (5 x 1 = 5)
- Which of the following is an example for brown algae?
- a) Chlorella b) Chlamydomonas c) Ectocarpus d) Polysiphonia
- Pili represent
- Extrachromosomal genetic element b) protoplasmic outgrowth of donor cells
- c) small flagella d) special bacterial cilia
- High frequency recombination cells arise when
- a) they have multiple F plasmids
- b) F plasmid has been incorporated into the bacterial chromosome
- c) conjugation and transformation happen at the same time
- d) bacterial chromosomes do not break during conjugation
- Name the pathogen that cause little leaf of brinjal:
- a) Pseudomonas b) TMV c) CMV d) Mycoplasma
- Wastewater is characterized by a very low value of
- a) turbidity b) BOD c) dissolved oxygen d) dissolved organics
- State whether the following statements are true or false: (5 x 1 = 5)
- Fungal cell wall is made of chitin.
- Nutrient Agar medium is suitable for the cultivation of heterotrophic bacteria.
- In transformation, the genetic material is transferred through bacteriophage.
- Xanthomonas citri is a gram positive rod shaped bacterium.
- Spoilage of meat by microbes can be prevented by storage at -20°C.
III. Complete the following: ( 5 x 1 = 5 )
- The reserve food material in red algae is ________.
- Bacteria which grow at very low temperatures are called _______.
- Transfer of genetic material between cells by physical contact is called _______.
- The host where the uredinal stage of Puccinia is seen is __________.
- The organism used in the production of wine is _____________.
- Answer the following, each in about 50 words: (5 x 1= 5)
- What are complex viruses?
- Define organolithotrophs.
- What are Okazaki fragments?
- Give the composition of Bordeaux mixture.
- What is pasteurization?
PART B
Answer the following, each answer not exceeding 350 words. Draw diagrams wherever necessary: (5 x 7= 35)
- List out the salient features of microalgae.
(or)
- Give an account of the characteristic features of fungi.
- Explain briefly about the development of endospore.
(or)
- Write notes on the methods used for quantification of microorganisms.
- Discuss briefly about the process of conjugation.
(or)
- Give an account of gene regulation in bacteria.
- Write short notes on citrus canker and its control.
(or)
- Explain briefly about Tobacco mosaic disease.
- Give an account of Cheese production.
(or)
- Write short notes on microbial enzymes.
PART C
Answer any three of the following, each answer not exceeding 1200 words. Draw diagrams wherever necessary: (3 x 15= 45)
- Discuss in detail about the salient features of viruses and their classification.
- Write detailed notes on the ultrastructure of a bacterial cell.
- Give a detailed account of a) transformation and b) transduction.
- Explain about the symptoms, pathogen, disease cycle and control of Black rust disease in wheat.
- Explain in detail about the processes involved in the treatment of domestic wastewater.
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