Amicrobiologist inoculates staphylococcus epidermidis and escherichia coli into a culture medium. following incubation, only e. coli grows in the culture. what is the most likely explanation?

The culture medium must be selective

Explanation:

Selective media are the media that have those ingredients which favor the growth of a particular bacterium and inhibit the growth of unwanted bacteria. So a selective media is used to selectively grow a particular micro-organism.

For example, MacConkey agar is a selective media that is used to isolate gram-negative enteric bacteria based on lactose fermenting ability. It contains ingredients like bile salt and crystal violet which inhibits the growth of gram-positive bacteria therefore it only allows the growth of gram-negative bacteria.

Staphylococcus epidermidis is a gram-positive bacteria and E.coli is gram-negative enteric bacteria so MacConkey agar can be used to select E.coli over Staphylococcus epidermidis. So the correct answer is the culture media must be selective.

glacial erosion, the picking up and movement of earth beneath a glacier, is also referred to as plucking. erosion and transportation of individual pieces of bedrock, especially large "joint block occur as a result of this glacial erosion. plucking is type of erosion in which rocks become frozen into the bottom and sides of the glacier.as the glacier moves downhill it 'plucks' the rocks frozen into the glacier from the ground.

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