BIOL 441 Final Spring 2021

How much percentage of sodium chloride we have in brain heart infusion medium

• 0.9 %

• 6.5 %

• 7.5 %

• 4.7 %

When esculin reacts with water it produce

• Glucose

• Esculetin

• Glucose and Esculetin

• Glucose and sodium hydroxide

Esculetin reacts with ..............to form a dark brown complex

• Ammonium sulphate

• Ferric chloride

• Potassium chloride

• Ferric citrate

To identify streptococcus in lab, we isolate sample from

• Skin

• Nasal Cavity

• Pharynx

• Nose

Optochin reagent has

• Ethylenediamine hydrochloride

• Ethylenediaminetetraacetic acid

• Ethylhydroxycupreine hydrochloride

• Ethylhydroxycupreinetetraacetic acid

In CAMP Test, Streptococcus agalactiae will produce

• Narrow junction

• Arrow head junction

• Streak wide junction

• Hollow junction

Reagent to confirm the presence of glycine is

• Diphenylamine reagent

• Fenton's reagent

• Ninhydrin reagent

• Sakaguchi's Reagent

Hippuric acid is hydrolysed by hippuricase into

• Sodium benzoate

• Sodium Chloride

• sodium hippurate

• sodium sulphate

Agar medium we use to identify streptococcus in lab

• Blood Agar Plate

• Bile Esculin agar

• Selective Strep Agar

• NaCl Broth

Lancefield serologic groups for streptococcus are,

• A, B, C, D, E, and G

• A, B, C, D, F, and G

• A, B, C, D, E, and F

• A, B, D, E, F, and G