bio

• an undefined nuclear region containing only nucleic acids is called nucleoid
• the nucleus has a double layered covering of nuclear membrane
• functional segments of DNA are called genes.
• organisms whose cell lack a nuclear membrane are called prokaryotic cells
• organisms with cells having a nuclear membrane is called eukaryotic cells
• the chlorophyll in photosinthetic prokaryotic bacteria is associated with membranous vesicles but not with plastids as in eukaryotic cells
• the cytoplasm is the fluid content inside the cell membrane