cell structure of animal and plant cell Flashcards
describe structure and function of golgi apparatus
a stack of membrane flattened stacks; secretory vesicles bring materials to and from the Golgi. Site of protein modification (adding sugars to make glycoproteins), protein folding in enzyme/hormone.
describe structure and function of mitochondrion
- inner membrane folded into cristae: provides large SA for electron carrier proteins in aerobic resp.
describe structure and function of vacuole
- outer layer = tonoplast
- contains cell sap = maintains cell stability to by exerting pressure on cell wall
describe structure and function of lysosomes
- contains hydrolytic enzymes
-digest dead organelles
describe structure and function of centrioles
- made of tubulin
- responsible for spindle fibre formation during cell division
describe structure and function of RER
- covered in ribosomes
- site of protein synthesis
describe structure and function of SER
- NO ribosomes
- site of cholesterol, lipid, hormone and steroid synthesis
describe structure and function of nuclear pore
allows the movement of MRna out of the nucleus
describe structure and function of nucleolus
- contains RNA to synthesise ribosomes
3 different ways slides can be made for light microscopy
- dry mounting
- wet mounting
- squash slides
define magnification
the number of times larger an image appears compared to its actual size
define resolution
the clarity of an image that shows fine ultrastructural detail clearly.
how is image formed in laser scanning
laser scans specimen point by point and stacks layers of image at different depths -> 3D
how is image formed for TEM
electrons pass straight through specimen (2D + black and white)
how is image formed for SEM
electrons bounce off specimen surface and focused (3D black and white, but false colour can be added)
