1. What is the thin covering called that allcells have?

2. In addition to a cell membrane, what other cell boundary might some cells (such as plant cells) have?

1. ALL cells have a cell membrane.
2. Cell Walls.

Don't listen to the person above me. Fungi have cell walls of chitin, eubacteria have cell walls of peptidoglycan, plants have cell walls of cellulose, a lot of protists have cell walls (some of cellulose) and archaebacteria have another type of cell wall composition as well.

1. cell membrane is present in all cells.
2. plant cells have cellulosic cell wall
fungi have chitinous cell wall
bacteria have cellulosic cell wall covered with layers like glycocalyx and slime layer
monerans have cell wall made of muco polysaccharides.
animal cells do not have cell wall and gametes also do not have cell wall.