Transcript Cell Structure and Function

Cell Structure and Function
Procaryotic Cells
• No membrane bound
organelles
• Typically unicellular
Eukayotic Cells
Have membrane bound
organelles
Typically multicellular
Nucleus
Ribosomes
• Composed of two
subunits consisting of
rRNA and proteins
• Attached and
unattached ribosomes
• Polysomes
Rough ER
• Proteins produced are
exported from cell
• All proteins enter
lumen to be modified
Smooth ER
• Testes cells smooth
ER produces steroids
• Liver cells smooth ER
detoxifies alcohol
• All cells smooth ER
produces vesicles for
transportation of
proteins to the golgi
bodies
Golgi Bodies
• Modifies, packages,
stores and distributes
proteins
• Proteins from rough
ER will be shipped to
cell membrane for
exocytosis
• Produces lysosomes
• Cis and trans face
Vesicles and Vacuoles
• Lysosomes contain
hydrolytic enzymes
• WBC have many
golgi bodies
• Vacuoles carry larger
substances
• ex. bacteria
Mitochondria
• Site of cellular
respiration
(production of ATP)
• Cells using exocytosis
and endocytosis
require a great deal of
ATP
Plasma Membrane
• Lipids pass easily
through and polar
compounds require
proteins
• Proteins in cell
membrane determine
cell function
Plasomodesmata
Intercellular Links
Surface Area to Volume
• Cells require a
efficient removal of
wastes and in take of
nutrients
• This limits the size of
the cell