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Objectives of unit:
· Understand the structure and properties of the plasma membrane
· Investigate the properties of plasma membranes practically
· Explain passive transport mechanisms of diffusion and facilitative diffusion,
including the role of transporter and carrier proteins
· Define the process of osmosis
· Explain the process of active transport and the role of proteins and ATP
· Explain the processes of endocytosis and exocytosis
· Describe the properties of gas exchange surfaces in living organisms
· Explain how the structure of the mammalian lung is adapted for rapid
gaseous exchange…read more

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Cells have many membranes:
plasma membrane
tonoplast
outer mitochondrial membrane
inner mitochondrial membrane
outer chloroplast membrane
nuclear envelope…read more

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Membranes are flexible and able to break and
fuse easily
Neutrophil engulfing
anthrax bacteria.
Cover credit:
Micrograph by Volker
Brinkmann, PLoS Pathogens
5 m
Vol. 1(3) Nov. 2005.…read more

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Membranes allow cellular compartments to have
different conditions
pH 4.8
Contains digestive
enzymes, optimum
pH 4.5 - 4.8
lysosome
Membrane acts as
a barrier
pH 7.2
cytosol…read more

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Membranes are mainly made of phospholipids
phosphate group hydrophilic
head
phosphoester bond
glycerol
ester bond
fatty acid hydrophobic
tail…read more

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