B5.4 - Preventing Bacterial Growth (Finished)

Question 1

How often do bacteria multiply

Answer 1

Every 20 minutes in right temperature and having enough nutrients

Question 2

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

Answer 2

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

Question 3

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

Answer 3

The mean division time

Question 4

What are disinfectants?

Answer 4

Chemicals used to kill bacteria around us

Question 5

What are antiseptics?

Answer 5

Antiseptics are Disinfectants safe tu use on human skin

Question 6

What are antibiotics?

Answer 6

Antibiotics are chemicals that can be used inside our bodies

Question 7

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

Answer 7

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