A plough (UK) or plow (US; both /ËplaÊ/) is a tool or farm implement used in farming for initial cultivation of soil in preparation for sowing seed or planting to loosen or turn the soil. Ploughs were traditionally drawn by working animals such as horses or cattle, but in modern times are drawn by tractors.
Polar/Nonpolar Regions. In a biological membrane, the phospholipids are organized into a bilayer, which serves as the framework in which the other components of the membrane are embedded.
portion of the phospholipid molecule that is hydrophilic. phospholipid. molecule that forms the phospholipid bilayer of plasma membranes; has a polar, hydrophilic head bonded to two non polar, hydrophobic tails. nonpolar tail. portion of the phospholipid molecule that is hydrophobic.