1.3 Cytosis Flashcards
1
Q
why is cytosis needed
A
to transport large molecules
- enzymes
- antibodies
across cell membrane
2
Q
name types of cytosis
A
- exocytosis
- endocytosis
-(phagocytosis)
-(pinocytosis)
3
Q
why are they referred to as “bulk transport”
A
transport a large amount of material
4
Q
what is endocytosis
A
large particles or molecules transported into the cell
5
Q
explain the process of endocytosis
A
- cell membrane folds inwards to form a cavity around particles (invagination)
- membrane completely encircles the particles, ∴ forming a vesicle
- vesicle moves into cell
6
Q
what is phagocytosis
A
when solid material (bacteria) is taken into cell
7
Q
what is pinocytosis
A
when fluid is taken into cell
8
Q
what moves via exocytosis
A
(secreted proteins)
- hormones
- some enzymes
9
Q
where are secreted proteins found at the start of endocytosis
A
golgi body (modified before secretion)
10
Q
explain the process of exocytosis
A
- vesicles containing protein BUD OFF of golgi, ∴ going to the cell membrane
- vesicles FUSE with cell membrane
- protein secreted
11
Q
is cytosis a passive process?
A
no. it requires energy in the form of ATP
12
Q
A
