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Why does the ecoli and pseudomonas are different on the MacConkey agar?
MacConkey's agar is a differential media used to differentiate between lactose fermenting and lactose non-fermenting bacteria. E.coli is a lactose fermenter whereas Pseudomonas is a lactose non-fermenter.MacConkey's agar contains lactose as fermentable sugar and when it is fermented the pH of the medium decreases which is registered by neutral red (a pH indicator).Lactose fermenters such as E.coli produce pink colonies whereas lactose non-fermenters such as Pseudomonas produces colorless colonies. So the colors of E.coli and Pseudomonas colonies are different on MacConkey's agar.
Why is skim milk sugar not fermentable by yeast?
MILK SUGAR IS FERMENTABLE BY YEAST. BUT IT PREFERS SUCROSE (TABLE SUGAR). IT MOSTLY TAKES LONGER, UNLESS YOU HAVE A YEAST THAT HAS THE ENZYME SYSTEMS FOR LACTOSE (MILK SUGAR), WHICH SOME DOES.
What is the purpose of lactose in the macconkey agar?
to differentiate between the lactose fermented bacteria or non- lactose fermented bacteria
What is difference in coliform and non-coliform bacteria?
coliform ferment lactose and are non pathogenic, non-coliform do not ferment lactose and are pathogenic (true pathogens)
What is negative lactose fermentative organisms?
these are those bacteria which are not able to ferment lactose sugar hence are called non lactose fermenting or negative lactose fermenting organisms.
Is lactose polar or non-polar?
lactose is polar, it can dissolve in water, hense the blood stream
What you the difference between lactose free and non-dairy?
Non-dairy means there is no dairy in the product. Lactose free means the product contains little to no lactose. Hard cheeses are a good example because the lactose in the milk is eaten by bacteria during the cheese making process.
Can milk be non-lactose?
Milk naturally contains the sugar lactose. Lactose-free milk is made by 'pre-digesting' the lactose in the milk. This is done by adding the enzyme lactase to the milk. The enzyme breaks down the lactose and people who can't digest lactose properly (lactose intolerance) can drink the milk without side-effects.
Does non fat milk have lactox in it?
Nonfat milk contains lactose. Lactose is the naturally occurring sugar in milk. The only milk that does not contain lactose is labeled 'lactose free' and is available in full fat, reduced fat, and nonfat.
Is lactose a strong electrolyte a weak electrolyte or non-electrolyte?
Nonelectrolyte
What fiber is digested by colonic bacteria?
Fermentable
What are the names of two non-reducing sugars?
The disaccharides Sucrose and Trehalose are both non-reducing sugars.
