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Select the true statements about protein secondary structure.
A. In an α‑helix, the side chains are located on the outside of the helix.
B. The secondary level of protein structure refers to the spatial arrangement of short segments of the protein.
C. In a β‑pleated sheet, the side chains are located between adjacent segments.
D. Disulfide bonds stabilize secondary structure.
E. The α‑helix is held together by hydrogen bonds between the amide N−H and C=O groups.

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Answer:

The α‑helix is held together by hydrogen bonds between the amide N−H and C=O groups.

Disulfide bonds stabilize secondary structure.

Explanation:

Proteins have primary, secondary, tertiary and quartinary structures.

The secondary structure of a protein is the regular, recurring sequence of amino acid in a polypeptide chain. Secondary structure of proteins give rise to the folding observed in the structure of a protein.

The major secondary structures of a protein are α-helices and β-structures.

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