CITY UNIVERSITY OF NEW YORK MEDGAR EVE THE RS COLLEGE SUMMER 2017 BIOL 261-1 NAM
ID: 96288 • Letter: C
Question
CITY UNIVERSITY OF NEW YORK MEDGAR EVE THE RS COLLEGE SUMMER 2017 BIOL 261-1 NAME: PLEASE NOTE: ANSWER ALL QUESTIONS: 1. The gram morphology of the genus Salmonelia is? b. Gram positive rod e. none of the above C. Gram negative coccus a. Gram negative rod d. Gram positive coccus agar 2. The different types of hemolysis produced by Streptococci on, a. nutrient b. tryptic soy c. mannitol salt d. blood e. all of the above 3. The Gram stain is an example ofa stain a. Simple c. differential b. negative stain d. dark field 4. The antibiotie used to differentiate between the genus Staphylococcus is? a. Low concentration of bacitracin b. Low concentration of novobiocin c. Optochin d. none of the above 5 A medium used to selectively cultivate Staphylococcus and differentiate between the species is? a. Staphylococcus Medium 110 b. Mannitol Salt Agar d. Hektoen Enteric Agar c. Tryptic Soy Agar An enzyme produced by one species of Staphylococcus is? a. catalase 6. b. coagulase d. none of the above c. amylase The indicator for the presence of starch is which on application changes starch to a. phenol redyellow ciodineblue/black The gram morphology and arrangement of the genus Staphylococcus is? b. phenol red orange d, iodine d. iodine brownExplanation / Answer
1.Ans-a
Genus Salmonella is a rod-shaped gram-negative bacteria of the Enterobacteriaceae family.
2. Ans-d
Hemolysis means the breakdown of red blood cells. Streptococcus species grow better on blood agar and can be identified on the basis of their colony morphology and hemolytic reaction on sheep blood agar.
3. Ans-c
Gram staining is a differential method used to differentiate the bacterial species on the basis of chemical and physical properties of their cell walls.
4 .Ans-b
The antibiotic used to differentiate between the genus staphylococcus is novobiocin. It is used to differentiate Staphylococcus epidermis and Staphylococcus saprophyticus .