1. The differential aspect of MacConkey agar allows for the determination of which bacteria are lactose fermenters and which are not. 2. Blood agar is used to determine an organism's ability for hemolysis. Blood agar is differential in this regard. 3. EMB agar uses two dyes, eosin and methylene blue, to restrict the growth of gram-positive organisms, making this agar (EMB) in this regard. 4. Crystal violet dye in MacConkey agar will prevent some organisms from growing, making MacConkey agar in this regard. The crystal violet dye can also be used in the determination of the ability to ferment the carbohydrate in the agar; making MacConkey agar in this regard. 5. Use of an agar which contains an elevated amount of salt would allow some organisms to grow while preventing the growth of other organisms. This media would be considered selective

Based on only the given information, which organism is likely most resistant to thermal sterilization?     Org X, Z-value of 10.0 °C     Org Y, Z-value of 2.0 °C     Org Z, a mesophile     Org K, a psychrotroph

Do you think that you will be able to determine the CFU’s in the food samples by counting the colonies on the nutrient agar? Why or why not?

1. Where is staphylococcus aureus commonly found? 2. What staphylococcus aureus  its significance in medical microbiology?  3. Is staphylococcus aureus an obligate aerobe or facultative anaerobes?  4. can staphylococcus aureus  catabolism glucose or lactose? Does it produce strong acid products such as lactic or acetic acid?  5. Does staphylococcus aureus produce by product that are converted to alcohols?

Which of the following groups of bacteria require or will use oxygen for respiration i. obligate aerobes ii. facultative anaerobes iii. obligate anaerobes iv. microaerophile v. aerotolerant anaerobe i & iv ii. & iv Oi&ii i, ii, iv ii & iv

Based on the growth you saw on your Lee’s Agar plate, what conclusions can you make about the bacteria present in the yogurt sample?

Describe how a Triple Sugar Iron agar tube would appear if the following situation was true. Please note that all items in the following list are occurring in the same tube of agar. 1. Positive for glucose fermentation 2. Negative for lactose and sucrose fermentation 3. Positive for H2S production 4. Negative for gas production

29.  Identify a FALSE statement from the following,  Group of answer choices bacterial growth is related to nutrient concentration and availability sulfur is essential in growth medium for some amino acid synthesis none of the above is an false statement nutrients uptake can be via active or passive process culture medium must be sterile before inoculation     30.  Identify a CORRECT statement regarding  penicillin allergy? Group of answer choices the hypersensitive reactions are mediated by IgE penicillin is degraded to penicilloyl and other breakdown products all of the statements are correct penicilloyl haptens trigger most allergic reactions anaphylactic shock is the immediate danger penicillin can provoke

what information about the identity and physiology of a bacterium or yeast can be learned from examing colonies of unknown microorganisms growing on solid media (agar)

Which of the following the equipment is used to sterilize the nutrient broth and agar? O Bunsen burner O refrigerator O incubator autoclave Ở microwave