Quiz #3: February 3, 2005
1. Draw and name a storage lipid.
2. Draw and name a structural lipid.
For questions #1 and 2 can draw the
appropriate structure for the following categories:
3. Describe the dependence (in molecular terms) of
the melting point of a fatty acid upon,
a. Chain length:
The longer the acyl chain the
higher the melting point. More thermal
energy needed to disrupt the large surface area between tightly packed
acyl chains. Longer chains means greater surface area, means more
energy (heat) required to disrupt noncolvaent forces.
b. Unsaturation
the more unsaturation, the less
the melting temperature. Less thermal
energy needed to disrupt the surface area between
loosely packedunsaturated chains. Greater unsaturation means less
surface area,
means less energy (heat) required to disrupt noncolvaent forces.