The alpha helix and beta sheet are found at which level of protein organisation?

Primary structure

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Secondary structure

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Tertiary structure

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Quatenary structure

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Solution

The correct option is B Secondary structure
The alpha helix structure and the beta pleated sheets contribute to the secondary structures that are held together by hydrogen bonds.
The alpha helix has a right-handed spiral conformation. It is a polypeptide chain that is rod-shaped and coiled in a spring-like structure.
Beta pleated sheets are made of beta strands connected laterally by two or more hydrogen bonds. Each beta strand is made up of 3 to 10 amino acid residues.
Hence, the correct answer is 'Secondary structure'.

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