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Which is the surrogate marker for detection of methicillin resistance mediated by
mec A gene in Staphylococcus Aureus by disc diffusion method ?
(A) Cefpodoxime (B) Cefoxitin (0) Optochin (0) Bacitracin

All are correct about autoclave except :

(A) Used to sterilize surgical instruments in hospital

(B) Sterilizing conditions commonly used are temperature exposure of 121°C for
15 min at 15 pounds pressure

(C) Spores of Bacillus Atrophaeus is used as sterilization control

(D) Gravity displacement type is commonly used in laboratories

Which of the following is a selective medium for Salmonella Typhi ?
(^) Xylose lysine deoxycholate agar(B) Alkaline bile salt agar
(C) Mannitol salt agar (D) Thayer Martin medium

Which is not correct regarding oxidase test ?

(^) Used to identify bacteria which produce the enzyme cytochrome oxidase
(B) The test is performed on bacterial colonies from MacConkey’s agar

(C) Positive test is shown by purple color developing within 10 seconds

(D) Reagent used is 1% tetra-methyl-p-phenylenediamine dihydrochloride

Which of the following can be used to stain metachromatic granules of Corynebacterium
diphtheriae ?

(^) Albert’s stain (B) Neisser’s stain

(0 Loeffler’s methylene blue (D) All of the above

Which of the following cannot be cultivated in artificial culture media ?
(A) Cryptococcus neoformans ‏رق‎ Rhinosporidium seebri
(0) Blastomyces dermatitidis (D) Sporothrix schenckii

All are true about Sabouraud’s dextrose agar except :

‎pH of the medium is 8.6‏ ھ)

‎(B) Growth of saprophytic fungi is prevented by adding cycloheximide
(C) Constituents are peptone, dextrose and agar

‎(D) Used for the isolation of pathogenic and non-pathogenic fungi

‎Which of the following is/are true of dimorphic fungi ?
(A) Occurs as yeast form in tissues at 37°C

‎(B) Occurs as mycelial form in cultures at 25°C

‎(0) Sporothrix schenckii is a dimorphic fungus

‎(D) All of the above

‎007/2022 8 A