posted by Alex .
Describe the role of each of the following types of bonds in a polyamide:
a) covalent bonds
Alex, I'm not sure what your question is all about. Please clarify what kind of an answer you want.
Explain in terms of molecular structure why sugars have a relatively high melting point compared to hydrocarbons of a similar size.
See above. It's better to type your own question instead of piggy-backing on another one. Often the piggy-backed questions are overlooked.