Examine the peptide. Thr-Glu-Pro-Ile-Val-Ala-Pro-Met-Glu-Tyr-Gly-Lys Write the sequence using one-letter abbreviations. sequence: TKPIVAPMEYGK Estimate the net charge on the peptide at pH 7. charge at pH 7: Estimate the net charge on the peptide at pH 12.

Alpha helices are a type of secondary structure in proteins. What is the length of a 23.0 kDa single-stranded a-helical protein segment? Assume a mean residue mass of 110 Da. length:

Beta () sheets are a type of secondary structure in proteins. A segment of a single chain in an antiparallel 8 sheet has a length of 1.30 x 102 Å. How many residues are in this segment? number of residues: 85