B5.4 - Preventing Bacterial Growth (Finished) Flashcards

1
Q

How often do bacteria multiply

A

Every 20 minutes in right temperature and having enough nutrients

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2
Q

How can you investigate the effect of antibiotics and disinfectants on bacterial growth?

A

Using agar plates and calculating the cross sectional area of colonies grown or of clear areas of agar (using pie and circle maths)

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3
Q

What do you need to calculate the no of bacteria after a certain time?

A

The mean division time

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4
Q

What are disinfectants?

A

Chemicals used to kill bacteria around us

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5
Q

What are antiseptics?

A

Antiseptics are Disinfectants safe tu use on human skin

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6
Q

What are antibiotics?

A

Antibiotics are chemicals that can be used inside our bodies

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7
Q

Briefly how do you set up an investigation for the effects of disinfectants?

A

Adding circles of filter paper soaked in them to the culture plate

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