Is Blood Agar An Enriched Medium Or A Differential Medium Explain Quizlet?

What ingredient makes this medium differential?

The differential ingredient in MSA is the sugar mannitol.

Organisms capable of using mannitol as a food source will produce acidic byproducts of fermentation that will lower the pH of the media.

The acidity of the media will cause the pH indicator, phenol red, to turn yellow..

What ingredient makes MacConkey Agar differential?

lactoseThis 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 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.

Which test uses a medium that is both selective and differential?

MacConkey agarMacConkey agar is an example of a medium that is both differential and selective. The presence of bile salts, as well as crystal violet, within the media prevent gram-positive organisms from growing.

What type of medium is blood agar quizlet?

Blood agar contains general nutrients and 5% sheep blood. It is useful for cultivating fastidious organisms and for determining the hemolytic capabilities of an organism. Starch agar is a differential medium that tests the ability of an organism to produce certain exoenzymes, including a-amylase that hydrolyze starch.

Is blood agar selective or differential quizlet?

Terms in this set (14) Blood agar is Differential and enrich. Beta-hemolysis is complete hemolysis. It is characterized by a clear (transparent) zone surrounding the colonies.

What type of media is blood agar?

Blood agar is an enriched, bacterial growth medium. Fastidious organisms, such as streptococci, do not grow well on ordinary growth media. Blood agar is a type of growth medium (trypticase soy agar enriched with 5% sheep blood) that encourages the growth of bacteria, such as streptococci, that otherwise wouldn’t grow.

Why is blood agar considered a differential medium quizlet?

What is a blood agar? Medium with sheep’s blood in it. It a differential medium that is used to tell apart bacteria that produce exotoxins called hemolysins which destroy red blood cells and hemoglobin.

How is blood agar a differential medium?

Blood agar is a differential medium that distinguishes bacterial species by their ability to break down red blood cells. The ability to break down the cells will cause a change in the color of the blood agar. Some media are both differential and selective.

Why is blood agar considered an enriched medium?

Blood Agar (BA) are enriched medium used to culture those bacteria or microbes that do not grow easily. Such bacteria are called “fastidious” as they demand a special, enriched nutritional environment as compared to the routine bacteria.

What is nutrient agar principle of selectivity?

Nutrient agar is used for the culture of less fastidious organisms as a general medium. … The addition of biological fluids like horse or sheep blood, serum, egg yolk, etc. to the nutrient agar makes the medium more selective for certain fastidious organisms.

Is blood agar an enriched medium or a differential medium explain?

Examples of enriched media include sheep blood agar and chocolate (heated blood) agar. Selective media contain ingredients that inhibit the growth of some organisms but allow others to grow. … Blood agar is one type of differential medium, allowing bacteria to be distinguished by the type of hemolysis produced.