Which of the following tests is a specific test for proteins?

Explain the terms primary and secondary structure of proteins. What is the difference between $\alpha$-helix and $\beta$-pleated sheet structure of proteins?

The protein that is a structural material is

Which of the following is not an essential amino acid?

The $\alpha$-helix structure is found in which of the following?

Which of the following can be used to detect the presence of $\alpha$-amino acids?