What is insulin?

Which of the following statements is correct regarding the protein hemoglobin?

Structural changes in globular proteins due to extreme $pH$ or temperature are known as:

Identify the type of bond formed between the carboxyl group of one amino acid residue and the amino group of another amino acid residue.

The structure of hemoglobin contains ......... alpha chains.

In the secondary structure of a polypeptide chain,the folding of the chain is due to which type of bond?