Why don't bacterial cells have a cell membrane?

They do have cell membranes. Bacterium, prokaryotes, all share the phospholipid bilayer that holds together cells. Prokaryotes don't however have membrane bound organelles. read more

Bacterial cells most definitely have a cell membrane. Bacterial don’t have a nuclear membrane because they don’t have a nucleus. Most bacterial cells have a cell wall surrounding the cell membrane. Not all bacterial cells have a cell wall, however. read more

The cell membrane of a bacteria is a very thin layer, about 8 nanometers in thickness, that covers the whole body of the bacteria. If the cell membrane breaks, the contents inside the cell leak out and the cell dies. read more

All animals and plants are made of cells. Animal and plant cells have features in common, such as a nucleus, cytoplasm, cell membrane, mitochondria and ribosomes. Plant cells also have a cell wall, and often have chloroplasts and a permanent vacuole. Note that cells may be specialised to carry out a particular function. read more