Lactose is also called "milk sugar" because it comes from milk. Think LACTose, like in lactate, lactation, etc.
The source of lactose is cow's milk.
Dairy products such as milk, yogurt, and cheese contain lactose, a type of sugar.
Yes, Citrobacter species are capable of fermenting lactose. They possess the necessary enzymes to break down lactose into glucose and galactose, allowing them to use lactose as a source of energy.
no, it shows negative for lactose fermentation on MacConkey's agar
it allows bacteria to regulate the expression of genes involved in lactose metabolism in response to lactose availability. This enables efficient utilization of lactose as an energy source only when needed, conserving cellular resources when lactose is not present in the environment.
It means that the organism can use Lactose as an energy source
Negative lactose fermentative organisms are bacterial species that do not ferment lactose, a type of sugar. This means they are unable to utilize lactose as a carbon source for energy production. Examples include Salmonella and Shigella species.
lactulose is manufactured by enzymatic isomerization of lactose.
Probably because that is where the gram negative bacteria have found a food source. Lactose is not the perfered diet, but it works and they are most likely there because they can tolerate the environment, and survive (on lactose) when their #1 food source is not available.
Bacteria preferentially utilize lactose as a carbon source.
Lactose is present, otherwise the lac operon is not needed and is shut off.
The main ingredients in EMB agar that supply carbon for bacterial growth are peptones, beef extract, and lactose. Peptones and beef extract provide amino acids and nutrients, while lactose is a carbohydrate that bacteria can utilize as a carbon source through fermentation.