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Agar is a gelatinous substance extracted from seaweed. One of its many uses is to solidify nutrient broth used in growing bacteria on a petri dish. A petri dish is a two piece clear glass or plastic dish which keeps dirt or dust from falling into the sterile medium, but allows air to enter and carbon dioxide to leave.

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14y ago
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16y ago

hello; i want to know :how can i compensate the schrinkage of the agar plate in incubator after applying electrical current? can i compensate it with sodium chloride! thanks

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13y ago

around, enough to fill the bottom or the petri dish.

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Q: How much agar solution do you need for bacteria to grow on an agar plate?
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What does it mean to inoculate an agar plate?

to inoculate an agar plate you would place bacteria on the agar to grow


Why are there areas on the agar jelly where no bacteria are growing?

There are areas on the agar plate where no bacteria grow because that area was missed when the plate was streaked.


What are the Advantages for growing bacteria in a broth and on agar plate?

Agar plates gives you a more visual view of the bacteria growth but is limited in the amount of bacteria that can grow on the plate. With broth, you won't be able to see the bacteria colonies but you will be able to grow much more of the bacteria for sampling.


Why are some bacteria able to grow on count agar that contains milk even though they do not produce any proteases?

Because plate count agar is still agar. therefore, it still has all the nutrients that bacteria require to grow.


How do you recognize bacteria on agar plate and not confusing bacteria with eukaryotes like yeast or fungi?

Use selective media agar plates. Different types of agar will let bacteria grow and inhibit fungal growth, or vice versa.


What is the purpose of a control agar plate?

A control in an agar plate is the left over spot where you have put no bacteria swabs on, that way when the bacterias have grown you can see if the bacterias spread onto the control, or if the control stayed disinfected.


Will s aureus grow on a crystal violet agar plate?

Yes. S. aureus can grow on TSA plate because this plate is general purpose medium and has most nutrient for bacteria growth.


What type of semisolid medium is used to grow bacteria?

Agar is a semi solid medium used to grow bacteria.


What else grows on an agar plate other than bacteria?

Theoretically, anything. As the agar is a non-selective agar many bugs can grow on nutrient agar. The only ones that can't are ones that have different growing conditions or different characteristics that makes it difficult or impossible to grow, but that is more uncommon.


Why does gram-positive bacteria grow in mannitol agar?

Gram-positive bacteria grows in Mannitol agar because it contains a high level of salt. This type of agar allows only certain types of bacteria to grow, making it selective.Ê


What do scientists grow bacteria on?

Agar (a seaweed derivative)


What kind of agar should be used to grow bacteria from hands before and after washing for a grade 8 science fair?

blood or nutrient agar would work, but blood agar will most likely grow more bacteria.