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1:   Which of the following is not seen in cell wall of Gram negative bateria
Options:
  1. Peptidoglycan
  2. Lipopolysaccharide
  3. Lipoprotein
  4. Teichoic acid
Answer and Explanation

Answer: Option 4

Explanation:

The cell wall of Gram negative bacteria contain Peptidoglycan (10%), lipopolysaccharides, lipoprotein and phospholipid, while cell wall of Gram positive bacteria contain peptidoglycan (60-90%), teichoic acid and lipids. Discuss this in Forums

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2:   Which of the following is Gram negative
Options:
  1. Salmonella
  2. Pseudomonas
  3. Vibrio
  4. All of these
Answer and Explanation

Answer: Option 4

Explanation:

About 75% of known bacteria are Gram negative eg. Salmonella, Pseudomonas, Vibrio, Helicobacter, Haemophilus, Escherichia etc. Discuss this in Forums

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3:   The organism Treponema pallidum is a
Options:
  1. Thermoacidophile
  2. Methanogen
  3. Spirochaete
  4. Actinomycete
Answer and Explanation

Answer: Option 3

Explanation:

Treponema pallidum causes syphilis disease. Spirochaetes are slender, flexuous and helically coiled bacteria verying in length from 3-500um. Discuss this in Forums

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4:   Techoic acid is present in the cell wall of
Options:
  1. Gram positive bacteria
  2. Gram negative bacteria
  3. Archaebacteria
  4. All of these
Answer and Explanation

Answer: Option 1

Explanation:

Teichoic acid is an acidic polymer consisting of carbohydrate, phosphate and an alcohol. It binds metals, acting as receptor sites for some viruses and maintaining cells at low pH to prevent degradation of cell walls by self produced enzymes. Discuss this in Forums

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5:   Which of the following is not involved in the fermentatin of Sauerkraut?
Options:
  1. Leuconostoc mesenteroids
  2. Lactobacillus plantarum
  3. Leuconostoc delbruekii
  4. Sreptococcus faecalis
Answer and Explanation

Answer: Option 4

Explanation:

Sorry, No description available. Discuss this in Forums

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6:   Purity of seed is guaranteed by
Options:
  1. ICAR
  2. national seed corporation
  3. NBPGR
  4. none of these
Answer and Explanation

Answer: Option 2

Explanation:

Sorry, No description available. Discuss this in Forums

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7:   ------------causes soft rot with red stripe in sugarcane.
Options:
  1. a fugus
  2. a virus
  3. a bactrerium
  4. a protozoan
Answer and Explanation

Answer: Option 3

Explanation:

Sorry, No description available. Discuss this in Forums

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8:   Which disease is caused by Phytophtora infestans
Options:
  1. early blight of potato
  2. late blight of potato
  3. mosaic of tomato
  4. all the above
Answer and Explanation

Answer: Option 2

Explanation:

Sorry, No description available. Discuss this in Forums

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9:   Wilt of pigeon pea is caused by
Options:
  1. Xanthomonas citri
  2. Fusarium udum
  3. both the above
  4. none of these
Answer and Explanation

Answer: Option 2

Explanation:

Sorry, No description available. Discuss this in Forums

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10:   Agrochemical based agriculture includes ---------
Options:
  1. genetically modified plants
  2. DNA interference
  3. both of the above
  4. fertilisers and pesticides
Answer and Explanation

Answer: Option 4

Explanation:

Sorry, No description available. Discuss this in Forums

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I AM IGNORANT of absolute truth. But I am humble before my ignorance and therein lies my honor and my reward.
-Kahlil Gibran