Microbiology Media Types Quiz

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Questions and Answers

Which type of media is designed to support the growth of most nonfastidious bacteria?

  • Selective media
  • Supportive media (correct)
  • Differential media
  • Enrichment media

What type of media contains added growth factors like blood and vitamins?

  • Selective media
  • Supportive media
  • Enrichment media (correct)
  • Diffential media

Which medium is primarily used to inhibit the growth of certain bacteria using additives like bile salts and antibiotics?

  • Differential media
  • Enrichment media
  • Selective media (correct)
  • Supportive media

Which type of media provides distinct colonial appearances based on biochemical reactions?

<p>Differential media (C)</p> Signup and view all the answers

An example of selective media is which of the following?

<p>MacConkey agar (D)</p> Signup and view all the answers

What type of media is specifically formulated to provide distinct colonial appearances?

<p>Differential media (A)</p> Signup and view all the answers

Which type of media typically contains added growth factors such as yeast extract?

<p>Enrichment media (B)</p> Signup and view all the answers

Which of the following is NOT an example of selective media?

<p>Chocolate agar (D)</p> Signup and view all the answers

Supportive media is most effective for which type of bacteria?

<p>Nonfastidious bacteria (A)</p> Signup and view all the answers

Which characteristic is associated with differential media?

<p>Changes color to indicate biochemical reactions (C)</p> Signup and view all the answers

Flashcards

Supportive media

A type of media that supports the growth of many bacteria, but doesn't contain any special substances to encourage particular bacteria growth.

Enrichment media

Media with added nutrients, like vitamins or blood, that encourage growth of certain bacteria but might not support all types.

Selective media

Media containing substances that stop certain bacteria from growing, allowing for specific ones to thrive.

Differential media

Media that lets you tell different bacterial types apart by how their colonies change the media.

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Media examples

Various media types such as nutrient agar, sheep blood agar, MacConkey, or EMB.

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What is a supportive media?

A media that supports the growth of a wide range of bacteria, without any special ingredients to favor specific types.

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What are examples of supportive media?

Examples of supportive media include nutrient agar and trypticase soy agar, both providing essential nutrients for bacterial growth without specific enhancements.

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What is enrichment media?

Media that adds nutrients, like blood or vitamins, to encourage the growth of specific types of bacteria, often fastidious ones.

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What is selective media?

Media that includes substances like dyes or antibiotics to prevent the growth of specific bacteria, allowing certain types to thrive.

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What is differential media?

Media designed to reveal different bacterial types by how their colonies change the media, based on their biochemical reactions.

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Study Notes

Media Types

  • Supportive media: Support the growth of most non-fastidious bacteria. Examples include nutrient agar and trypticase soy agar.

  • Enrichment media: Contain added growth factors like blood, vitamins, or yeast extract to encourage bacterial growth. Examples are sheep blood agar, chocolate agar, brain-heart infusion, and buffered charcoal-yeast extract agar.

  • Selective media: Inhibit the growth of specific types of bacteria (e.g., gram-positive bacteria) using additives such as dyes, bile salts, alcohols, acids, or antibiotics. Examples include Columbia colistin–nalidixic acid (CNA) agar, eosin methylene blue (EMB), MacConkey agar, Hektoen enteric (HE) agar, xylose lysine deoxycholate (XLD) agar, and Thayer-Martin agar.

  • Differential media: Allow for the distinction of bacterial colonies based on biochemical reactions, like lactose fermentation or hydrogen sulfide (Hâ‚‚S) production. Examples include EMB agar, MacConkey agar, HE agar, and XLD agar.

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