The primary structure
the primary structure is the lowest level
Primary, tertiary and quaternary levels of protein structure.
The alpha helix and beta sheets are found at the Secondary level of protein folding. It's when the protein is taking its shape. Secondary structure
hydrogen bonds
Protein is very high in calsium. It will easily change to level 87
A protein is "denatured" when it inflates or deflates due to pH level, heat, Ect. Not sure if that's what you meant by losing its shape, though
When a protein is denatured it involves the disruption and possible destruction of both tertiary and secondary structures. The denature of proteins can happen through the exposure of chemicals or heat.
The quaternary level.
Protein often exhibit fourth level or quaternary structure. The dimer, is the simplest form of fourth level structures is called a dimer, which is seen in DNA binding protein.
Primary structure.
The coiling of the protein chain background into an alpha helix is the secondary structure. This is caused by the H-bonded arrangement of the backbone of th protein.
Quaternary