The secondary structure of protein is determined by

Which of the following is a conjugated protein?

Protein found in a biological system with a unique three-dimensional structure and biological activity is called a native protein. When a protein in its native form is subjected to a physical change like a change in temperature or a chemical change like a change in $pH$,denaturation of proteins takes place. Explain the cause.

Which of the following is $NOT$ a function of proteins?

Structures of alanine at $pH = 2$ and $pH = 10$ are respectively

The bond that determines the secondary structure of a protein is