yes i m agree with that Pure substances include only single atoms made of one element.
in chemistry , a pure substance that has only one kind of atom and cannot be broken into two or more simpler substance by physical or chemical means is an element . for ex. gold , silver , iron etc
The cell plasma membrane is composed of a phospholipid bilayer structure in which the hydrophobic tails of each phospholipid face inwards forming a hydrophobic core. The core restricts movement of hydrophilic substances across the membrane by repelling them. Hence the peptidoglycan precursors must be sufficiently hydrophobic in order to bypass the hydrophobic core of the bilayer and leave the cell to reach the cell wall.
Plants, animals, and microorganisms
The flagella and pili are similar in that they are both composed of proteins. <span>Flagella is made up of protein flagellin, while pili is composed of protein pilin. Both flagella and pili are tubular hollow, filamentous structures of bacteria. Both extend from the surface of the bacterial wall.</span>
