Which is not present in an α-helix?
Correct answer: B. Disulphide linkages
- A. H-Bonds
- B. Disulphide linkages
- C. Covalent bonds
- D. Amino acids
Explanation
Disulfide linkages (or bridges) are covalent bonds formed between the side chains of two cysteine residues. These bonds are involved in stabilizing the tertiary and quaternary structures of proteins, not the secondary structures like the a-helix.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Macromolecules
Proteins are classified by shape, composition and structure, from primary amino acid sequence to secondary, tertiary and quaternary organisation, and their biological roles are linked to this structure. Enzymes are examined as protein biocatalysts, including active sites, substrate specificity, activation energy, cofactors and factors affecting activity.
Practise Macromolecules
299 free Macromolecules MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.