Question

Alpha helices and beta sheets have common structural motifs but can contain very different amino acid sequences. For each of the following, circle the correct structure that could form given that sequence.

A. phe-leu-val-gly-ser-phe-leu-tyr-leu-gly-met-trp-leu-leu-phe-ile

amphipathic a helix hydrophilic a helix hydrophobic a helix

B. Ile-ala-asn-thr-leu-gly-thr-ala-ile-gln-ser-ile-ala-cys-leu-leu

amphipathic a helix hydrophilic a helix hydrophobic a helix

C. ser-ile-gln-leu-thr-phe-asn-met-glu-ile-glu-ala-thr-ile-arg-phe

amphipathic b sheet hydrophilic b sheet hydrophobic b sheet

D. asn-thr-asp-ser-tyr-asp-met-thr-ser-his-thr-asn-leu-lys-thr-ser

amphipathic b sheet hydrophilic b sheet hydrophobic b sheet