 In addition to providing a supportive structure for the cell, the known functions of the microtubules include transport of molecules, including neurotransmitter molecules bound for the synapses, and control of the cell's movement, growth and shape.Penrose's views on the human thought process are not widely accepted in scientific circles (Drew McDermott, David Chalmers and others).According to Marvin Minsky, because people can construe false ideas to be factual, the process of thinking is not limited to formal logic.