Definitions for "Primary structure"
The linear sequence of residues making up a polymer such as a nucleic acid, polysaccharide or protein.
The amino-acid sequence of a protein or nucleotide sequence of DNA or RNA
Sequence of units in a linear polymer, such as the amino acid sequence of a protein.
Keywords:  aircraft, fly, critical, bearing, load
A critical load-bearing structure on an aircraft. If this structure is severely damaged, the aircraft cannot fly.