Do proteins have to have each level of protein structure?

All proteins obviously have an amino acid order, however, If a protein does not form alpha helices or beta sheets does it still have a secondary protein structure? Furthermore, if the protein only forms one sheet/helix and does not bond with more does it have a tertiary structure?

Protein structure stages are based on the previous stage. Each level is created by a combination of the previous stage (so the sheets form the secondary structure and so on) so you need each level in order to form the next stage

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