The secondary structure of a protein, such as the alpha helix, is maintained by
Correct answer: C. hydrogen bonds between the carbonyl and amide groups of the backbone
- A. peptide bonds between amino acids
- B. ionic bonds between side chains only
- C. hydrogen bonds between the carbonyl and amide groups of the backbone
- D. disulphide bridges only
Explanation
Regular coiling or pleating arises because each carbonyl oxygen hydrogen bonds to an amide hydrogen further along the same chain, giving the alpha helix and the beta pleated sheet. Peptide bonds create the primary sequence, and side chain interactions such as disulphide bridges belong to the tertiary level. Heat breaks the weak hydrogen bonds and the structure unwinds, which is denaturation.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Classification of Proteins
Proteins are classified by composition as simple, conjugated and derived proteins, and by shape as fibrous or globular proteins. The topic relates these classes to examples such as albumin, keratin, collagen, haemoglobin and casein, while distinguishing structural proteins from proteins with transport, catalytic or regulatory roles.
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.
More Classification of Proteins questions
Proteins are classified as fibrous or globular. A fibrous protein such as keratin is
The pH at which an amino acid exists mainly as a zwitterion and does not migrate in an electric field is called its
An amino acid is described as amphoteric because it
Which pair correctly matches a macromolecule with its monomer?
The quaternary structure of a protein exists only when the molecule
Conjugated proteins differ from simple proteins in that they contain