... biology is merely the study of specific phenomena: self replicating chemical systems capable of mutation that have evolved over the past 3.8 billion years.
But biology is just another view of the physics which apply equally to humans and computers which makes dealing with the particular nature of humans (and related creatures) easier to understand. Biology is an artificial construct. Electrons don't care if they are in an organic neuron or the processor of a computer. The same laws apply. Granted, computers have not been developed as much or with the same complexity of human brains, but there is no barrier saying they can't.