Phospholipids

• What replaces one of the fatty acid molecules in phospholipids?

  A phosphate molecule
• How do fatty acid molecules behave in relation to water?

  They repel water and are hydrophobic
• What is the behavior of phosphate molecules in relation to water?

  They attract water and are hydrophilic
• What are the two parts of a phospholipid?

  Hydrophilic head and hydrophobic tail
• How does the hydrophilic head behave in relation to water and fat?

  It is attracted to water but not fat
• How does the hydrophobic tail behave in relation to water and fat?

  It orients away from water and mixes with fat
• What term describes molecules with two ends that behave differently?

  Polar
• What happens when polar phospholipid molecules are placed in water?

  They position hydrophilic heads close to water
• How do the hydrophobic tails position themselves in water?

  They orient themselves away from water
• What is the significance of the arrangement of phospholipids in water?

  It forms a barrier that separates environments