Ro ugh endoplasm ic
reticulum (R E R ):
A membrane system
attached to ribosomes
where new proteins and
phospholipids are made.
Chromatin
Nucleolus
Polyribosome
Matrix
Cristae
N ucleus:
A large structure consisting of a
nuclear envelope with pores;
contains the genetic material that
controls and directs cell activities.
Nuclear envelope
Nuclear pore
M itochondrion (pl.
mitochondria):
A folded inner membrane surrounded
by a smooth outer membrane; makes
most of the cell's ATP, has its own
DNA, and divides independently of
the rest of the cell.
R ib o so m es:
Small units of RNA, associated with
RER and floating freely in the
cytosol, that are involved in making
new proteins.
Plasm a m em brane,
or
cell m em brane:
A lipid bilayer barrier that separates the inside of the
cell from the outside; controls the flow of materials
into and out of the cell and plays a role in
communication between cells and recognition by
other cells.
G o lgi com plex,
or
G o lgi apparatus:
A stack of 3-20 membrane sacs that serve as a
relay station where newly made proteins are
processed and sorted to various destinations
within the cell, such as the plasma membrane
or various organelles.
Cells Have Distinct Parts 51
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