The PDF version of Hw2 only for review-ELEMENTARY Multiple_Answer 1. which of th

Question

The PDF version of Hw2 only for review-ELEMENTARY Multiple_Answer 1. which of the followings are true about protein structures: A. Primary structures are linear B. Tertiary structures are determined by primary structures C. Secondary structures are primarily stabilized by hydrogen bonds D. All proteins have quaternary structures E. disulfide bonds are ionic bonds Multiple_Answer 2. Which of the followings are true about protein primary structures: A. They are read from N to C terminal B. Amino acids are linked by hydrogen bonds to form primary structures C. You can NOT obtain protein primary structures from genes D. Peptide bonds are very stable Multiple_wr3. which of the followings are true about peptide bonds? A. Peptide bonds are partial double bonds due to electron resonance B. The four atoms in a peptide bond are in the same plane c. The two alpha carbons surrounding a peptide bond are not in the same plane as the peptide bond D. Neighboring peptide bonds are able to rotate freely relative to each other E. cis peptide bonds are more stable than trans peptide bonds Multiple_ Answer 4. which of the followings can be used to obtain protein tertiary structures? A. X-ray crystallography B. NMR C. Edman degradation D. Gene sequence

Explanation / Answer

Ans

1 A. True

Primary structure are linear because by the convention primary structure starts with amino terminal N and ends with carboxy terminal C.

B. True

primary structure of a biological polymer determines the 3D shape or tertiary structure and used to predict local features.

C. True

The secondary structure are stabilized by hydrogen bonds because of the hydrogen bond between Oxygen of C=O and Hydrogen of N-H group.

2A. True

Primary structure starts with N and ends with C terminal.

3A True

Peptide bonds are partial double bond due to electron resonance because it exists in trans configuration.

4A x ray crystallography and

B NMR are used to obtain protein tertiary structure.

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