Bacteria

1. Which of the following bacterial cells are found in cubical packets?

  1. Lactobacillus
  2. Sarcinae
  3. Clostridium
  4. Corynebacterium
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Answer: Option B. Sarcinae

2. Which of the following bacteria forms an endosymbiotic nitrogen-fixing association with legume roots that helps in Nitrogen Fixation?

  1. Rhizobium
  2. E.coli
  3. Streptococcus
  4. Bacillus
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Answer: Option A. Rhizobium

3. What makes it possible to identify Gram Positive Bacteria using Gram staining?

  1. The thin peptidoglycan layer does not retain the crystal violet stain
  2. The cell wall lacks teichoic acids
  3. The thick peptidoglycan layer retains the crystal violet stain
  4. The presence of an outer membrane prevents staining
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Answer: Option C. The thick peptidoglycan layer retains the crystal violet stain

4. What is the shape of Vibrio bacteria?

  1. Comma-shaped
  2. Spherical
  3. Rod-shaped
  4. Spiral
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Answer: Option A. Comma-shaped

5. Effective treatment of tuberculosis is difficult due to the abnormal structure and chemical composition of which of the following cells of tuberculosis bacteria (Mycobacterium tuberculosis)?

  1. Cell membrane
  2. Nucleus
  3. Cytoplasm
  4. Cell wall
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Answer: Option D. Cell wall