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40. What is agar? 41. What is agar extracted from? 42. What is agar composed of?...

40. What is agar?

41. What is agar extracted from?

42. What is agar composed of?

43. At what temperature does agar liquify? Solidify?

44. What kind of medium is TSA?

45. What does EMB stand for?

46. What is the carbon source on EMB that enables differentiation?

47. What kind of bacteria does EMB differentiate between?

48. What is the appearance of E. coli on EMB?

49. What makes MacConkey media selective?

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Homework Answers

Answer #1

Ans-40- a gelly like unbranched polysaccharide, used as a solidifying agent.

Ans-41- Red algae (Galidium and Gracilaria).

Ans-42- agarose and agaropectin

Ans-43- approximately 85-degree centigrade. solidify at 32 to 40-degree centigrade.

Ans-44- general-purpose media

Ans-45- Eosine Methylene Blue

Ans-46- lactose

Ans-47- lactose fermenting and non-lactose fermenting bacteria

Ans-48-  blue-black colonies, often with a green metallic sheen

Ans-49- crystal violet and bile salt

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