More than amino acids linked together is considered a protein.

Over 50 amino acids in a chain are considered a protein.

More than 100 amino acids linked together is considered a protein.

Explanation:

The scientists categorize the links of amino acids based on the number of aminoacids:

Peptides: two to ten amino acids  

Polypeptides: 11 to 100 amino acids

Proteins are 100  and more of 100 amino acids.

A protein is a chain of amino acids linked by peptide bonds.  They are responsible of the biochemical reaction of cells.

i would say the prokaryotic cells the prokaryotic cells are less complex, are usually found only in unicellular organisms and have more limited capabilities than eukaryotic cells.

dude i stopped reading after the first 7 words but hey you seem real smart thats awesome have a great day