PRACTICAL SKILLS

Question 1

How does a serial dilution work

Answer 1

Take 1 ml of the sample and place it into 9 ml of solution
take 1 ml from that first test tube and transfer it into 9ml of solution
continue doing so.

if bacteria is involved make sure it is sterile and an atiseptic technique is involved.

Question 2

If the calculated t- test value is greater than the critical value what can be said about the null hypothesis

Answer 2

reject the null hypothesis
the difference between the means is significant
not due to chance

Question 3

If the calculates t-test value is lower than the critical value what can be said about the null hypothesis

Answer 3

accepted
the difference between the means isn’t significant
due to chance

Question 4

What do scientific drawings have to be/ include

Answer 4

Title
scale
half the page
proportions correct
ruler labelled lines - no arrow heards
no shading
no overlapping lines
fine pencil

Question 5

How do you convert between mm to nm

Answer 5

x 1000

Question 6

how do you convert between nm and um

Answer 6

x1000