Proteins
Which level of protein structure is maintained primarily by hydrogen bonds between backbone C=O and N–H groups?
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About This Question
- Subject
- chemistry
- Chapter
- biomolecules
- Topic
- proteins
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Secondary structure
The secondary structure of a protein (α-helix, β-pleated sheet) is stabilised by hydrogen bonds formed between the carbonyl oxygen (C=O) and the amino hydrogen (N–H) of the peptide backbone at regular intervals. Primary structure is defined by covalent peptide bonds. Tertiary structure involves interactions among R-groups (disulphide bridges, hydrophobic, ionic and H-bonds between side chains). Quaternary structure is the association of multiple polypeptide subunits.
This medium difficulty chemistry question is from the chapter biomolecules, covering the topic of proteins. It appeared in the 2025 exam.
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