Is Conscience a Product of Internalised Prohibition?

Conscience IS internalized prohibitions. That is not to reduce morality to a mere mechanism - we can create our own prohibitions to internalize, based on belief and experience, and what we think and feel about it. But the 'voice of conscience' only comes into play when we have internalized the idea that something is wrong or prohibited. Otherwise the function of conscience would not be performed by a reflex-like emotion, but would have to occur each time by deliberate consideration.