lecture 12 (cytoskeleton) Flashcards
why vesicle proteins are needed?
for scaffolding and strength ( provide the structural support for cell attachment)
type of cell functions that are mainted by cytoskeleton:
1) cell movement
2) organelle
3) vesicle movement
4) cell contraction
Why cell needs three types of cytoskeletal proteins?
Eukaryotic cells perform different functions
and the three types of proteins are specialised in different functions
characteristics of cytoskeleton:
- highly dynamic (continuously changes)
- has 3 types of cytoskeleton protein (microtubules, actin, and intermediate filaments.)
- helps support large volume cytoplasma
True or False: The cytoskeleton is considered the bone and muscle of the cell
TRUE
what are the some examples of large scale movement that cytoskeleton is respoinsible of?
- crawling of cells on surface
- contraction of muscles
- changes of cell shape as an embryo grows
rank cytoskeletal protein form largest to smallest:
microtubules > intermediate filments > microfilments
Why they are called intermediate ?
because
their diameter are between the microfilaments and microtubules.
True or False: Intermediate filaments are the weakest and most fragile of the cytoskeletal
filaments
FALSE
what differes the intermediate filaments from microfilmement and microtubules?
the polarity, intermediate filament isnt polar
what is the type of interaction between intermediate filament protein?
non-covalent
———- is the intermediate filament found in epithelial cells
keratin
what is the name of the cell junction that filments connect to?
desmosome
what is the main filaments found in muscle cell?
vimentain
what helps stregthen the axon of the nerve cell?
neurofilment
