Cell membranes

7 important questions on Cell membranes

Where consist a phospholiped of?

hydrophilichead: Choline, phosphate, glycerol
hydrophobictail: Fatty acids

What is a transmembrane protein?

alpha helix, the N-terminus on the etracellular matrix side and eterminus on the cytoplasmic side.

What are the six major functions of membrane proteins?

transport, enzymatic activity, signal transduction, cell-cell recognition, intercellular joining, attachment to the cytoskeleton and extracellular matrix.
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Which transport systems do we have?

sodium-potasium pump, cotransport, bulktransport

What is a sodium-potasium pump?

a transport protein in the plasma membrane of animal cells that atively transport sodium out of the cell and potassium into the cell

What is bulk transport?

large mulecules, such as polysaccharides and proteins, cross the membrane in bulk via vesicles. and it occurs by exocytosis ad endocytosis.

When a plant cell is submerged in a very hypotonic solution, what is likely to occur?
The cell will burst
the cell membrane will lyse
plamolysis will shrink the interior
the cell will become flaccid
the cell will become turgid

the cell will become turgid

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