Class VIII

Bacteria which have ability t o convert milk sugar in to lactic acid is called
  1. lactobacillus
  2. streptococcus
  3. gram positive bacteria
  4. gram negative bacteria
A bacterial cell lacks
  1. flagella
  2. chromosome
  3. cell wall
  4. nucleus
Cell wall of yeast is made up of
  1. chitin
  2. cellulose
  3. water
  4. salts
Introduction of dead or weak germs in to body orally or by injection to train body to fight real germs on attack is called
  1. vaccination
  2. immunization
  3. both a and b
  4. infecting
A medicine which is used to treat or cure bacterial diseases by killing or stopping their growth of bacteria is called
  1. antibody
  2. antigen
  3. antibiotics
  4. antiseptics
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