These are
single layered membranous sac
like structures formed from the vesicles of endoplasmic reticulum or golgi
bodies.
These are -Peroxisomes or Glyoxisomes .
Peroxisomes
Peroxisomes
are formed from pre-existing peroxisomes. These are found in plants showing “Photorespiration” (C -3 plants).
Peroxisomes participate in the process of
photorespiration along with choloplast and mitochondria.In peroxisome oxidation
of glycolic acid (produced in chloroplast in photorespiration) occurs.
These are also
found in animal cells like “Protozoons” residing in liver or kidney
cells. In peroxisomes ,catalases,oxidases enzymes are present. These enzymes
assist degradation of toxic materials in cells. Peroxisomes invole in
fat-metabolism in animal cells.
Glyoxisomes
These are also single layered membrane bound spherical
bodies found in cell showing “Glyoxylate cycle” Enzymes of glyoxisomes participate in glyoxylate
cycle and helps in conversion of fat into carbohydrate.
Spherosomes
These are single layered membrane bound spherical
bodies found in plant cells. Some enzymes like proteases ,ribonucleases,phosphatases are found in these. Spherosomes collect ,transport
fatty substances.
