00:01
Hi, in this answer we are going to define the term transition temperature, identify the characteristics of the membrane that affects the transition temperature and we are going to see what are the changes that happens in a membrane when there is a drop in the temperature.
00:24
So a biological membrane is made up of a phospholipid bilayer which has the hydrophilic phosphate head group and a hydrophobic fatty acid tail group.
00:51
So the phosphate heads are oriented towards the outside of the cell membrane while the fatty acid tails are oriented towards the inside of the biological membrane.
01:08
So the biological membrane has a hydrophobic core as the fatty acids are oriented towards the inside.
01:18
So transition temperature is defined as a temperature at which there is a change in the face of the membrane.
01:30
That is, it changes from a gel face to a liquid face.
01:38
So in the gel face, the fatty acids are tightly bound to each other and they are in an ordered fashion whereas in a liquid phase they are in a disordered fashion as they move away from each other so the temperature at which the membrane changes from a gel to a liquid phase is called as a transition temperature coming to the characteristics of the membrane which that affects the transition temperature first first one is the chain length of the fatty acids.
02:19
So if the fatty acids are long, then they have higher transition temperature because they have increased surface area compared to the smaller length fatty acid chains which increases the vanderwalt's attraction between them and increases the transition temperature...