MICROANATOMY

Detailed explanation-1: -Peroxisomes can be derived from the smooth endoplasmic reticulum under certain experimental conditions and replicate by membrane growth and division out of pre-existing organelles. Peroxisome matrix proteins are translated in the cytoplasm prior to import.

Detailed explanation-2: -Peroxisomes are found in all eucaryotic cells. They contain oxidative enzymes, such as catalase and urate oxidase, at such high concentrations that in some cells the peroxisomes stand out in electron micrographs because of the presence of a crystalloid core (Figure 12-31).

Detailed explanation-3: -In plants, peroxisomes are involved in various cellular processes such as -oxidation of fatty acids, phytohormone biosynthesis, catabolism of polyamines, detoxification of hydrogen peroxide and photorespiration.