Question: Why Is MacConkey Agar Selective As Well As Differential Quizlet?

What is the difference between selective and differential media quizlet?

Differential media helps you distinguish between groups of organisms that are related.

You can often tell the difference by color or colonies.

What is the purpose of selective media.

The purpose of selective media is to isolate specific types of bacteria..

What is the difference between selective and differential?

Selective and differential media are used to isolate or identify particular organisms. Selective media allow certain types of organisms to grow, and inhibit the growth of other organisms. … Differential media are used to differentiate closely related organisms or groups of organisms.

What makes MacConkey Agar both selective and differential?

This medium is both selective and differential. The selective ingredients are the bile salts and the dye, crystal violet which inhibit the growth of Gram-positive bacteria. The differential ingredient is lactose.

Is starch agar selective or differential?

Starch agar is a differential medium that tests the ability of an organism to produce certain exoenzymes, including a-amylase and oligo-1,6-glucosidase, that hydrolyze starch.

Is EMB Agar selective or differential?

Selective for Gram negative Organisms Eosin–Methylene Blue (EMB) Agar is a differential medium for the detection of Gram negative enteric bacteria.

What is the purpose of selective media quizlet?

A Selective Medium is a culture medium designed to allow the growth of some kinds of organisms, but not others.

Is MacConkey agar selective or differential quizlet?

For what is MacConkey Agar selective and differential? Selective: for Gram-negative bacteria because bile salts and crystal violet inhibit the growth of Gram-positive bacteria. Differential: based on ability to ferment lactose (bacteria that can ferment lactose cause a drop in pH which turns indicator pink).

Which media is selective and differential?

Selective media generally selects for the growth of a desired organism, stopping the growth of or altogether killing non-desired organisms. Differential media takes advantage of biochemical properties of target organisms, often leading to a visible change when growth of target organisms are present.

Is pea selective or differential?

PEA agar is a selective medium that permits the growth of gram-positive cocci while inhibiting most gram-negative organisms.

What are examples of selective media?

Examples of selective media include:Eosin methylene blue contains dyes that are toxic for Gram-positive bacteria. … YM (yeast extract, malt extract agar) has a low pH, deterring bacterial growth.MacConkey agar is for Gram-negative bacteria.Hektoen enteric agar is selective for Gram-negative bacteria.More items…

Is blood agar selective or differential?

Blood Agar This medium can be made selective by the addition of antibiotics. This medium is differential because: Blood Agar tests for the production of hemolysin which breaks down red blood cells.

Is nutrient broth selective or differential?

Nutrient broth, tryptic soy broth, and brain heart infusion, are all examples of complex media. Media that inhibit the growth of unwanted microorganisms and support the growth of the organism of interest by supplying nutrients and reducing competition are called selective media.