The level of protein structure that describes all aspects of the three-dimensional folding of a polypeptide is referred to as

Tertiary structure - three-dimentional structure of one polypetide chain.

Proteins are considered as for their conformation in four different stages:

Primary structure is referred solely to the sequence of amino acids in the polypeptide chain.
Secondary structure is the immediate basic folding of a protein and it can be α-helix and β-sheets.
Tertiary structure is the three-dimentional folding of a singles polypetide.
Quaternary structure is the thee-dimenional structure that results from the combination of two or more individual polypetides working as single protein.

There are  advantages  to being  multicellular  rather than unicellular. these include allowing: the  organism  to be larger.