Cell membranes

Question 1

a phospholipid molecule

Answer 1

made of a hydrophilic phosphate group, glycerol head and 2 hydrophobic fatty acid tails

Question 2

parts of a cell membrane

Answer 2

cholesterol to stabilise the membrane, glycoproteins and glycolipids for cell recognition and joining cells, intrinsics proteins, enzymes, carrier proteins, receptors

Question 3

effect of changing temperature of cell membrane

Answer 3

excess heat causes molecules within channel proteins to vibrate due to increased kinetic energy so hydrogen bonds break and the protein loses their shape which allows molecules to freely pass through them

Question 4

effect of alcohol on cell membrane

Answer 4

alcohol such as ethanol dissolves the phospholipid bilayer so allowing molecules to freely pass through the membrane