Alzheimer’s patients have plaques made of amyloid-beta proteins deposited in their brains. The mass of these plaques is approximately 7.5 mg and the molecular of amyloid-beta protein is 4513.1 Da. Knowing that there are 13.5 x 109 neurons in the grey matter of the cortex (where amyloid proteins are located), how many amyloid beta proteins are in the cortex per neuron.

Alzheimer’s patients have plaques made of amyloid-beta proteins deposited in their brains. The mass of these...