Final answer:
Integral proteins have a tertiary structure and their secondary structure is characterized by alpha helices and beta sheets. The number of residues needed for the secondary structure can vary.
Step-by-step explanation:
Integral proteins are a type of membrane protein that are embedded within the lipid bilayer of cell membranes. These proteins have a tertiary structure, which is the overall three-dimensional arrangement of the protein. The tertiary structure of integral proteins is characterized by the presence of alpha helices and beta sheets, which are examples of secondary structure. The number of residues (amino acid units) needed for the secondary structure of integral proteins can vary, but it typically ranges from tens to hundreds of amino acids.