NEET 2026
- Exam
- NEET
- Year
- 2026
- Subject
- Chemistry
- Chapter
- Biomolecules
NEET 2026 · Chemistry · Biomolecules
Alpha-helix is found in which level of protein structure ?
Alpha-helix is found in which level of protein structure ?
Options
- ASecondary structure
- BTertiary structure
- CPrimary structure
- DQuaternary structure
Correct answer
A. Secondary structure
Step-by-step solution
The primary structure of a protein refers to the linear sequence of amino acids.
The secondary structure refers to the local folded structures that form within a polypeptide due to interactions between atoms of the backbone. The most common types of secondary structures are the -helix and the -pleated sheet.
The tertiary structure is the overall three-dimensional structure of a polypeptide.
The quaternary structure is the arrangement of multiple folded protein or coiling protein molecules in a multi-subunit complex.
Therefore, the -helix is found in the secondary structure of proteins.
Answer: Secondary structure
The secondary structure refers to the local folded structures that form within a polypeptide due to interactions between atoms of the backbone. The most common types of secondary structures are the -helix and the -pleated sheet.
The tertiary structure is the overall three-dimensional structure of a polypeptide.
The quaternary structure is the arrangement of multiple folded protein or coiling protein molecules in a multi-subunit complex.
Therefore, the -helix is found in the secondary structure of proteins.
Answer: Secondary structure