CELLS - 2

• In prokaryotes ribosomes are about 15 nm by 20 nm in size and made of two subunits - 50S and 30S units -70S prokaryotic ribosomes.

• Several ribosomes may attach to a single mRNA and form a chain called polyribosomes or polysome.

• Reserve material in prokaryotic cells are stored in the cytoplasm in the form of inclusion bodies, which lie free in the cytoplasm. Example- phosphate granules, cyanophycean granules.
• Gas vacuoles are found in blue green and purple and green photosynthetic bacteria.

EUKARYOTIC CELLS

• Eukaryotic cells -- organised nucleus with a nuclear envelope and genetic material is organised into chromosomes.
• Plant and animal cells 

• Eukaryotic cells -complex locomotory cytoskeletal structures.
• The endomembrane system includes endoplasmic reticulum (ER), golgi complex, lysosomes and vacuoles.
• Since the functions of the mitochondria, chloroplast and peroxisomes are not coordinated with the above components, these are not considered as part of the endomembrane system