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Lecture 13

BIOL 1012 Lecture Notes - Lecture 13: Endocytosis, Membrane Protein, Exocytosis


Department
Biology
Course Code
BIOL 1012
Professor
Suman Batish
Lecture
13

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Bio 2/20
Research on another membrane protein lead to discovery of aquaporins
o Research on Rh protein
Cells expend energy in the active transport of a solute
o Cell must expend energy to move solute against concentration
gradient
o ATP supplies energy for most active transport
Exocytosis and endocytosis transport large molecules across membranes
o Exocytosis: exports bulky molecules, like proteins or
polysaccharides
o Endocytosis: takes in large molecules
o In both, material is packaged within a vesicle that fuses within
the membrane
o Two kinds of endocytosis
Phagocytosis: engulfment of the particle
Receptor-mediated endocytosis: uses membrane
receptors for specific solutes
Used to take in cholesterol from blood
Cells transform energy as they perform work
o House thousands of chemical reactions
Some release energy, some require it
o Energy: the capacity to do work
Kinetic: energy of motion
Ex: thermal, light
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