CHAPTER 2
Cell Structure and Function
17
Mitochondria
vary both in size and shape and in the appearance of their
cristae
, yet they are generally the easiest organelles to
identify in
transmission electron micrographs. The striking features are the
double
membrane
and the
cristae
, which are inwardly
directed extensions of the inner mitochondrial membrane. The
RER
typically consists of fl
attened, membrane-delimited sacs. The
distinguishing feature of RER is the presence of ribosomes (polyribosomes) attached to the outer surface of the membrane.
SER
also consists of membrane-delimited spaces, but these are usually in the form of a labyrinth of branching tubules. The surface of
the membrane of SER is smooth, with no attached ribosomes.
Golgi complexes
are composed of stacks of fl
attened, membrane-
delimited sacs along with associated vesicles. Shapes of the sacs can vary, but often they are bowl shaped, so that there is a convex
face (the forming face) and a concave face (the maturing face).
Cisternae
of rough
endoplasmic
reticulum
Lysosome
Lysosome
Golgi complex
Cristae of
mitochondrion
Double
membrane of
mitochondrion
Figure 2-4.
Cytoplasmic organelles.
EM,
3
66,000
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