gsce biology revision Flashcards
what is a eukaryotic cell?
a cell that contains a nucleus
what is a prokaryotic cell?
a cell that does not contain a nucleus
what does a nucleus do?
controls what happens in the cell and carries genetic information
what is a cytoplasm and what does it do?
jelly like substance where chemical reactions happen
what is the role of the cell membrane?
controls what gets in and out of the cell
what are ribosomes?
tiny round structures where new proteins are made for the cell
what is the mitochondria?
jelly-bean shapes structure where respiration occurs and an organism gets its energy
what is the vacuole?
a space filled with cell sap and helps support the cell
what do chloroplasts do?
they contain chlorophyll and is where the cell makes glucose for photosynthesis
what does the cell wall do?
it is made of tough cellulose to give the cell support and structure
what is an estimation?
an educated guess based on evidence/results
why do we use estimates?
to get rough data
how do you work out the magnification?
image size / actual size
draw the triangle to work out magnification, image size or actual size
i
a x m
what is an electron microscopes source?
electrons
what is a light microscopes source?
light
which is better: a higher resolution or a lower resolution?
lower resolution
does the electron microscope have a higher or lower resolution compared to the light microscope?
lower resolution
does the light microscope have a higher or lower resolution compared to the electron microscope?
higher resolution
what are specialised cells?
cells that have a specific function (they are well adapted)
where are sperm cells found?
in the males body
where are egg cells found?
in the females body
what is sperm used for?
to fertilise an egg
what is the egg cell used for?
it is used for sexual reproduction
