2.1 Cell structure Flashcards
1
Q
Some light microscopes don’t magnify beyond x1500. Why is that?
A
Because after a mag of x1500 resolution does not improve: object’s can’t be distinguished any further
2
Q
What is the function of a stain?
A
Increase contrast
Make organelles visible
3
Q
What is the purpose of nuclear pores?
A
To allow substances to move between the cytoplasm and nucleus such as mRNA or ribosomes
4
Q
How is the structure of a mitochondrion adapted to it’s function? (2)
A
- cisternae are folded to maximise SA and increase rate of respiration taking place
- double membrane present to separate reaction from cytoplasm
5
Q
Why are lyric enzymes stored within lysosomes?
A
to protect useful organelles within a cell from hydrolysis/digestion
6
Q
Describe the roles of the cytoskeleton (5)
A
- allows cell to have a shape
- change shape
- gives cell strength
- allows organelles to move within the cell
- allows movement of the entire cell I.e cilia/flagella
7
Q
What is the cytoskeleton composed of?
A
Microtubules and microfilaments
