These are questions that are available shortly after each lecture and remain posted for only 24 hours following the lecture. The objective is to have you go through the questions soon after each lecture as a way of self-assessing your current understanding. Then, depending on how well you know the answers, you can adjust your learning accordingly. In other words, use these questions to test your own retention of the material and/or to highlight gaps in your understanding that you need to fill. Answers will not be posted, so for questions you're not sure about, exhange answers, work together, ask your TA...whatever...but use this option as a way of directing your own learning to make your time as efficient and effective as possible.

Lecture 35

1. How many different pentapeptides can be made from the L-isomers of two alanines, one valine, one serine and one phenylalanine?

2. What is a zwitterion?

3. Why is the formation of a dipeptide from two amino acids called a condensation reaction?

4. The peptide bond between carbon and nitrogen in O=C-NH- is said to have partial double bond character. How is this possible?

5. When polypeptides begin to fold into their stable three-dimensional structures in an aqueous solution, what is the major character of the side chains of the amino acids that are on the surface of the resulting arrangement?