Biology Year 9 EOY Exam

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Order the method of how to carry out the Disinfectant investigation

Overeenkomen met de tekst (klikken en slepen)   

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Zoek de tekst op

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Klik en sleep

With tweezers, get a little paper circle, dip gently into the first disinfectant and place onto the petri dish where the 1st disinfectants initals should be written

Repeat with each disinfectant. Make sure you put the tweezers in the alcohol and then put into flame to sterilise it

With a spreader (nicknamed a 'hockey stick') dip in alcohol and then hold in the Bunsen burners flame and then distribute the bacteria evenly across the bottom of the dish

Write names and disinfectants' initials on petri dish

Dip a circle in the alcohol and place in the petri dish, like the disinfectants

Sellotape the petri dish so that the bacteria can't escape.

Using a sterilised pipette, take a drop or two of your chosen bacteria and put it on the petri dish on top of the agar


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