1. Bacterial strains that do not grow in the absence of a specific nutrient are called
A) Heterotrophs
B) Chemotrophs
C) Autotrophs
D) Auxotrophs
2. Which one of the following components of bacterial cell acts as endotoxin?
A) Peptidoglycan of Gram-positive bacteria
B) Lipopolysaccharide
C) Porins
D) Peptidoglycan of Gram-negative bacteria
3. Which among is considered as GRAS status?
A) Bacillus
B) E.coli
C) Lactobacillus
D) Penicillium
4. An endospore forming bacteria:
A) Bacillus
B) Sporosarcina
C) Thermoactinomyces
D) All the above
5. Which among the following is a method for cultivation of anaerobic bacteia?
A) Roll tube method
B) Lawn culture
C) Stab culture
D) All the above
6. Bacterial conjugation was described by
A) Zinder and Lidenberg
B) Lederberg and Tatum
C) Tatum and Zinder
D) Beadle and Tatum
7. Mesosomes are present in
A) Only gram negative
B) Only gram positive
C) Both Gram positive and negative bacteria
D) None of the above
8. Lophotrichous bacteria have:
A) one flagellum
B)a cluster of flagella at one or both ends
C) a single flagellum at each pole
D) flagella that are spread evenly over the whole surface
9. Bacterial membrane contains sterol like molecules called hapnoids. Hapnoids are
A) Penta cyclic sterols
B) Tetra cyclic sterols
C) Heptacyclic sterols
D) None of these
10. Which bacterial cell wall has a huge percentage of Teichnoic acid?
A) Gram Positive
B) Gram Negative
C) Both Gram Positive and Gram Negative
D) Gram Neutral
Answer:
1. D) Auxotrophs
2. B) Lipopolysaccharide
3. C) Lactobacillus
4. D) All the above
5. A) Roll tube method
6. B) Lederberg and Tatum
7. C) Both gram positive and negative bacteria
8. B)a cluster of flagella at one or both ends
9. A) Penta cyclic sterols
10. A) Gram Positive