Question

What stabilizes the secondary structure of proteins?

• A. Number of purines and pyrimidines is equal universally in DNA
• B. Number of purine pairs and pyrimidine pairs is equal only in similar forms of DNA but varies from A form to B form
• C. Number of purines and pyrimidines is equal but may vary
• D. The number of purines and pyrimidines depends on the pitch of the DNA

Answer 1

The correct option is B

Number of purine pairs and pyrimidine pairs is equal only in similar forms of DNA but varies from A form to B form

Within the long protein chains there are regions in which the chains are organised into regular structures, which forms the secondary structure of protein. The most common secondary structures are alpha-helices (alpha-helixes) and beta-pleated sheets. These secondary structures are held together by hydrogen bonds.