Lysosomes function in intracellular digestion in a variety of circumstance. Peroxisome is a specialized metabolic compartment bounded by a single membrane. They contain enzymes that transfer hydrogen from various substrates to oxygen. Unlike lysosomes, peroxisome are not budded from the endomembrane system. They grow by incorporating proteins and lipids produce in the cytosol.
Mitochondria are the organelles that convert energy to forms that cells can use for work.
The number of mitochondria is based upon the cell s level of metabolic activity. Nonmembrane organelles within the cells include microtubules and microfilaments. They form a framework called the cytoskeleton, which reinforces the cell s shape and functions in cell movement. The cytoskeleton is constructed from at least three types of fiber microtubules, microfilaments, and intermediate filaments. A special arrangement of microtubules is responsible for the eating of the flagella and cilia.