The primary structure of a protein is the distinct sequence of amino acids in each polypeptide chain that makes up the protein. This is essentially simply a sequence of which amino acids exist in which order in a polypeptide chain, not a structure. However, since the final protein structure is essentially dependent on this sequence, this is called the polypeptide chain's primary structure.

the dissolution of polymer can be thermodynamically described in 2 steps.

it was spontaneous.

"ain't i a woman? " is the name given to a speech, delivered extemporaneously, by sojourner truth, (1797–1883), born into slavery in new york state.sojourner truth' delivered her famous speech "ain't i a woman? " (which did not have a title at that moment) was given without any previous preparation. her dissertation took place at the women's convention in akron, ohio, in 1851.