Multiple choice exam. please mark the BEST answer to each question. All of the f
ID: 1001562 • Letter: M
Question
Multiple choice exam. please mark the BEST answer to each question. All of the following general statements are true of the peptide main-chain of a protein except the peptide bond is non-planar. the peptide bond nearly always has the trans configuration, except sometimes with proline residues which can have a cis configuration. the peptide bond has some double bond character (40%) due to resonance which occurs with amides, the peptide main-chain configuration can be defined by three torsion angles. the peptide bond is formed by a condensation reaction.Explanation / Answer
1. The peptide bond is polar , due to the electro negativity difference between carbon and nitrogen.
2. The peptide bond is normally trans configuration, but it excepts some times with proline residues which have cus configuration.
3.the peptidebondhas some doble bond character(40%)due to the resonance which occurs with amides.
4. the peptidemain chain configuration can be defined by the 2 torsional angles, they are called Ramachandran angles.
5. Condensation reaction:
The addition of large NUMBER of monomers by kissing of simple molecule like water ,ammonia, and so.
The peptide bond formed by the condensation reaction.
Answer: Option 2,3,5 are true.
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