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Lecture 3

Biology 1202B Lecture Notes - Lecture 3: Membrane Transport Protein, Transmembrane Protein, Cell Membrane


Department
Biology
Course Code
BIOL 1202B
Professor
Patrick Mc Donald
Lecture
3

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Kaden VanHelden
Lecture 3 - Cell Membrane and Transport continued
Exocytosis
Used for molecules too big to go through transmembrane protein
Membrane bound vesicle contains molecules to me removed/secreted
from cell
oVesicle fuses with plasma membrane at release
oVesicle membrane is recycled into cell membrane
Endocytosis
Reverse of exocytosis
oPlasma membrane in folds creating a vesicle
Cells bring in macromolecules too large for transmembrane import
Pinocytosis – vacuole created around extracellular 'uid
oNon-speci)c
oConstant
o“cell drinking”
Receptor mediated endocytosis
Transmembrane proteins recognize target molecule
oBinding leads to pocket formation
oVesicle formation
oHighly speci)c
oAcquire bulk quantities of a speci)c molecule
Membranes and cell signaling
One of the characteristics of life is the ability to respond to changes in
the environment
oAt the cellular level this means perceiving and reacting to a
signal
Directly from the environment in single celled organisms
From the environment or from other cells in multi-cellular
organisms
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