what is the definition of magnification?
how big an object is
the difference between the size of the image and the size of the object
the degree to which the size of an image is larger than the object itself
what is the definition of resolution?
the degree to which it's possible to distinguish between to objects that are very close together
how detailed an image looks
how blurry an image looks
what is the resolution and magnification of a light microscope?
res = 2000 nm, mag = x2000
res = 200 nm, mag = x 1500
res = 200 micrometres, mag = x2000
how many micro metres is one cm equivalent to?
one hundred thousand
one million
ten thousand
how many nanometres is one cm equivalent to?
ten million
one hundred million
what is the maximum magnification and resolution of a scanning electron microscope?
mag = x500 000, res = 0.2 nm
mag = x 500 000, res = 2 nm
mag = x100 00, res = 0.2 nm
what is the maximum magnification and resolution of a transmission electron microscope?
mag = x 100 000, res = 0.2 nm
mag = x500 000, res = 2 nm
what is a disadvantage of an electron microscope?
samples need to be prepared in a vacuum so electron beam is not deflected by molecules in the air
it has a maximum resolution which is 1000 times greater than a light microscope
it needs to be cleaned in ethanol daily
what is the cytoskeleton made of?
carbohydrate strings
protein fibres
phospholipids
what is the main role of the cytoskeleton?
provide stability for the cell
control what substances enter or leave the cell
restrict the movement of hydrophilic substances past the cell
how are microtubules arranged inside flagella and cilia?
in a ring of 9
in a ring of 11 with 1 in the centre
in a ring of 9 with 2 in the centre
what are plant cell walls made of?
murein
cellulose
amylose
what is the function of lysosomes?
to packages and modify proteins
produce ATP during respiration
contain a powerful digestive enzyme to break down waste materials
what is the highly folded inner membrane of a mitochondria called?
cristae
matrix
epithelium
