practical: light microscope

Question 1

what can you use to stain sample cells

Answer 1

iodine

Question 2

what is the risk of iodine

Answer 2

may cause allergic reaction or skin rash

Question 3

how can the risk of using iodine be minimised

Answer 3

wear gloves and goggles

Question 4

why do you stain sample cells

Answer 4

so you can see them

Question 5

what is the risk of using a sharp knife

Answer 5

cuts

Question 6

how can you minimise the risk of using a sharp knife

Answer 6

cut away from body and cut on a chopping board

Question 7

which lens do you use first when viewing a cell under a microscope

Answer 7

lowest power lens

Question 8

how do you increase the magnification of the image

Answer 8

increase the power of the objective lens

Question 9

how do you bring the image to clearer focus

Answer 9

turn the fine focus wheel to adjust the height of the stag

Question 10

what is the formula to calculate the real size of a cell

Answer 10

magnification=length of drawing/ actual length of cell

Question 11

what are the advantages of using an electron microscope rather than a light microscope

Answer 11

higher resolution and magnification

Question 12

suggest why ribosomes cant be seen though a light microscope

Answer 12

they are too small

Question 13

when measuring the lenth of a cell from an image what unit should you use

Answer 13

mm

Question 14

how many µm are in a mm

Answer 14

1000

Question 15

how do you convert mm into µm

Answer 15

multiply by 1000

Question 16

what should you do when you have increased the magnification and the image is still fuzzy

Answer 16

turn the fine focus wheel