cell structure

Question 1

what do plant cells have that animal cells do not?

Answer 1

Chloroplasts and cell wall.

Question 2

what cells are Eukaryotic?

Answer 2

Animal, plant, protist and fungi are all eukaryotes as they all have a nucleus.

Question 3

what is a prokaryotic cell?

Answer 3

a cell with no nucleus e.g. bacteria, archaea and cyanobacteria

Question 4

How do you safely Prepare a slide for a plant cell?

Answer 4

you can only use one layer of cell (in most examples the film of an onion) due to the use of a light microscope. you place your cell on the slide then put drops of stain (iodine). leave for approximately three or four minutes before gently placing a cover slip on top of your DNA. do not squish!

Question 5

How do you safely Prepare a slide for an animal cell?

Answer 5

you take one layer of cell (normally cheek cells in school) due to the use of a light microscope. rub your cheek cell swab on the centre of your slide. take some dye( methylene blue) and put drops on where you rubbed your swab. then you gently place the cover slip on your slide.

Question 6

what is better about an electron microscope rather than a light one?

Answer 6

the electron microscope has a higher resolution and magnification.

Question 7

what is better about a light microscope rather than an electron one?

Answer 7

you cannot view living cells on an electron microscope but you can on a light one.

Question 8

resolution meaning?

Answer 8

the ability to see two things separately (not one a fuzzy dot/ ability to focus)

Question 9

Magnification formula

Answer 9

real size times by image size

Question 10

Real size

Answer 10

image size divided by magnification.

Question 11

Binary fission

Answer 11

Bacteria multiply by simple cell division every 20 minutes.

Question 12

how to make an uncontaminated culture?

Answer 12

o Petri dishes and culture media must be sterilised before
use
o inoculating loops used to transfer microorganisms to
the media must be sterilised by passing them through a
flame
o the lid of the Petri dish should be secured with adhesive
tape and stored upside down
o in school laboratories, cultures should generally be
incubated at 25°C.

Question 13

Describe why uncontaminated cultures are necessary in

research

Answer 13

it is necessary as it allows the results to not be skewed by the presence of unwanted microorganisms.