The helical structure of a protein is kept by the formation of hydrogen bond between amino acid molecules which are:
Correct answer: B. In successive spiral turns
- A. Adjacent to each other
- B. In successive spiral turns
- C. Between two different polypeptide chains
- D. None of the given options
Explanation
The most common types of secondary structures are the α helix and the β pleated sheet. Both structures are held in shape by hydrogen bonds, which form between the carbonyl 'O' of one amino acid and the amino 'H' of another. Hydrogen bonding between amino groups and carboxyl groups in neighboring/adjacent regions of the protein chain sometimes causes certain patterns of folding to occur. Known as alpha helices and beta sheets, these stable folding patterns make up the secondary structure of a protein.
This question appeared on the NUMS 2015 paper, which you can sit online with every answer explained.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
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
The following statements describe three orders of the structure of the insulin molecule. The molecule consists of two polypeptide chains joined and folded around one another. The sequence and number of amino acids in each polypeptide chain are known. The amino acids in each chain are coiled into alpha-helix and held in position by hydrogen bonds. Which order is described by each statement?
Antibodies are?
Match the following classification of amino acids on the basis of side chain:
Haemoglobin molecule exhibits which structural organization of proteins?
Globular proteins differ from fibrous proteins in _.
The sequence of amino acids is major factor in which type of protein classification;