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ib bio unit 4
the phospholipid bilayer
what are all internal membranes made up of
it increases the size of the cell membrane
exocytosis impact on cell size
decreases the size of the cell membrane
endocytosis impact on cell size
membrane fluidity
what allows for seamless transition into/out of the cell membrane
large cells need lots of nutrients and energy to survive. they also generate lots of waste.
why large cells are inefficient
small cells are more efficient as it takes less time for them to transport materials
why most cells are small
must be large in order for the cell to be efficient
Surface Area to Volume ratio (SA:V) in a cell
volume decreases
surface area increases as
surface area increases
volume stays constant as
Long, skinny, or flat shapes, folds in the membrane
cell shapes that increase SA:V ratio
compartmentalization
Presence of phospholipid bilayers (membranes) allows for
the specialization of different organelles therefore, more complex cellular functions
compartmentalization allows for
eukaryotic cells
compartmentalization is only present in
Lysosomes contain hydrolytic enzymes that need to be packaged to prevent cellular damage
example of compartmentalization
nucleus, mitochondria, and chloroplast
organelles with double membranes
surrounds the nucleus and protects the DNA, regulates gene expression
nuclear envelope functions
integral proteins that allow materials to enter and exit the nucleus
nuclear pore
Note 
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