Which of the following is FALSE regarding secondary structures? In the \(\beta\)-sheet, the R groups are on one side of the plane. In the \(\alpha\)-helix, the hydrogen bonds are roughly parallel to the axis of the helix. The \(\beta\)-sheet can be parallel or antiparallel. Secondary structure describes the position of all backbone atoms of a protein In the \(\alpha\)-helix, the R groups point outward from the helix.
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Which of the following statements is false? In the beta sheet secondary structure the side chains are oriented perpendicular to the plane of the sheet, extending out from the plane on alternating sides In an alpha helix all of the hydrogen bonds lie parallel to the helix axis. Moreover, all of the carbonyl groups are pointing in one direction along the helix axis while the N-H groups are pointing in the opposite direction In an alpha helix, each hydrogen bond closes a loop containing 13 atoms In an anti-parallel beta sheet, an amino acid cannot bond directly (linearly) to the complementary amino acid in an adjacent chain as in the parallel beta sheet In the anti-parallel arrangement of a beta sheet the hydrogen bonds are aligned directly opposite each other, making for stronger and more stable bonds
Alexander B.
4. The secondary structure of proteins is made of a few characteristic patterns that occur frequently within folded proteins. These recurring shapes, which are particularly stable, are named ̑̑-helix and ̑̑-sheet. Which of the following statement about ̑̑-helices and ̑̑-sheets is wrong? (a) ̑̑-helices and ̑̑-sheets are stabilized by hydrogen bonds forming between the amino and carbonyl groups in the polypeptide backbone. (b) In an ̑̑-helix, the helix makes a complete turn every 3.6 amino acids. (c) ̑̑-sheets can be called parallel and anti-parallel. (d) The nature of the amino acid side chain is important for the folding of ̑̑-helices and ̑̑-sheets. (e) A segment of an ̑̑-helix composed of nonpolar amino acids can span a membrane bilayer.
Adi S.
Which of the following statements about β-sheet structures is true? Parallel β-sheet structures have backbone amides that directly hydrogen bond between strands, whereas antiparallel β-sheets have hydrogen bonds that are offset. The individual strands of all β-sheet structures are connected by turns, helices, or loops. All amino acid side chains in antiparallel and parallel β-sheet structures point to one side of the sheet. All β-sheet structures form a spiraling backbone chain.
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