Final answer:
Tubulin molecules do not pair with each other to form paired helical filaments (PHF). PHF is formed by aggregated tau proteins and is found in neurodegenerative diseases like Alzheimer's disease.
Step-by-step explanation:
The statement that Tubulin molecules pair with each other to form paired helical filaments (PHF) after the collapse of the assembly is false.
Tubulin molecules are the protein subunits that compose microtubules. They come together to form dimers (pairs) of alpha and beta tubulin, which then polymerize to form the hollow microtubule cylinders. Microtubules have various functions in cells, including maintaining cell shape, organizing cell division, and facilitating the movement of organelles and cells.
Paired helical filaments (PHF) are structures found in neurodegenerative diseases like Alzheimer's disease. They are formed by abnormally aggregated tau proteins, not tubulin molecules. PHF is one of the major components of the neurofibrillary tangles characteristic of Alzheimer's disease.