Regular coiling or zigzagging of polypeptide through hydrogen bonding is its_______________?
Correct answer: B. Secondary structure
- A. Quantum structure
- B. Secondary structure
- C. Tertiary structure
- D. Primary structure
Explanation
The regular alpha-helical coiling and beta-pleated zigzag arrangement of a polypeptide are produced mainly by hydrogen bonds between peptide backbone groups. These local folding patterns define secondary protein structure, whereas tertiary structure describes the overall three-dimensional folding of one chain. Choosing tertiary structure confuses local backbone folding with complete chain folding.
Last updated
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.
Exams that ask Chemistry questions like this
Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.