Final answer:
true . Desmin intermediate filaments grow by the addition of desmin protein monomers primarily at the (+) end.
Step-by-step explanation:
The statement is true - Desmin intermediate filaments (IFs) grow by the addition of desmin protein monomers primarily at the (+) end. Intermediate filaments are a diverse group of cytoskeletal filaments that are composed of multiple strands of polymerized subunits. Desmin, an intermediate filament protein, is found in desmosomes and acts as a structural protein in muscle cells, connecting Z-disks and contributing to muscle contraction.