096/23

55. Which biotyping method focuses on the identification of specific surface antigens or
markers on microorganisms ?
A) Phage typing B) Serotyping
C) Genotypic typing D) Biochemical typing

56. Which of the following antibiotic inhibits folic acid synthesis by competitively inhibiting
the enzyme dihydropteroate synthase ?
A) Penicillin B) Vancomycin C) Gentamicin D) Trimethoprim

57. Different types of bacteria have different oxygen growth requirements. In the table
given below, Column | shows names of different bacterial groups and Column II
shows their descriptions. Select the correct combination.

Column | Column Il

Obligate anaerobe 8 Killed by oxygen

2 | Obligate aerobe | | Must have abundant oxygen

Capnophile Likes carbon dioxide
(4 | Microaerophile ٥ Grows with or without oxygen

5 | Facultative anaerobe 8 Needs only a small amount of oxygen
80) 1-9, 2-0, 3-०, 4-9, 5-6 8) 1-8, 2-0, 3-०, 4-0, 5-6
७) 1-8, 2-0, 3-०, 4-6, 5-0 0) 1-8, 2-0, 3-6, 4-०, 5-0

58. Which of the following statements about the lysogenic cycle of bacteriophages is true ?

A) In lysogenic cycle, the temperate phage does not replicate itself independently
and does not lyse the bacterial host cell

B) Phage DNA is incorporated into the host bacterium’s DNA; at this time it is
called a prophage

C) Temperate phages can be replicated either as a prophage along with bacterial
chromosomal replication or can suddenly revert to the lytic cycle by replicating
themselves and assembling into new phages

D) All of the above

59. Which of the following diagnostic media is used to identify Salmonella in clinical and
food samples ?
A) Brilliant Green Agar B) Eosin Methylene Blue Agar (EMB)
C) Mac Conkey Agar D) Mannitol-Salt Agar