2. 2.3.1 Draw, label,
annotate and
identify organelles in
a diagram of the
ultrastructure of a
liver cell.
Ribosome
the site of protein synthesis
3. 2.3.5 State three differences between plant
and animal cells.
Plant cells Animal cells
Cellulose cell wall is present Cell wall absent, cellulose in any form is
also absent
Vacuoles are large and prominent Vacuoles absent and if present they are
small and temporary and associated
with excretion or secretion
Reserve energy source in the form of Reserve energy form is glycogen
starch
Centrioles absent but polar caps Centrioles present
participate in cell division instead
Chloroplasts present Chloroplasts absent
4. 2.3.6 Outline two roles of extracellular components.
Plant cell wall
• Found around all plant
cells
• Composed of cellulose.
• Maintains the shape of
the cell.
• Provides structural
support against the force
of gravity.
• Prevents excessive uptake
of water by the cell
http://micro.magnet.fsu.edu/cells/plants/cellwall.html
5. 2.3.6 Outline two roles of extracellular components.
Basement membrane in the kidney
• Basement membrane: a secretion formed
from collagen and glycoproteins joined
together by a third 'linkage' protein. Their
exact composition varies form tissue to
tissue.
• Support: the membrane surrounds the
tissues of lines ducts. It provides
structural support for the integrity of the
tissue or organ. Usually found as the basal
lamina or basement membrane of
epithelial cells.
• Filter : The basement membrane of the
http://www2.niddk.nih.gov/NIDDKLabs/Glomerular_Disease_Primer/NormalKidney.htm
http://click4biology.info/c4b/2/cell2.3.htm#electron
kidney glomerulus provides the effective
barrier for ultrafiltration
