The Roman Catholic church teaches the doctrine of transubstantiation--that the bread and wine literally become the body and blood of Jesus. It seems that the sacrament of taking the body and blood gives the partaker a special grace.
Jesus introduced this by saying, "This is my body which is broken for you" and "This is my blood which is shed for you" prior to His crucifixion.
So, my question is this. Does the Catholic Church teach that the bread and wine taken by the disciples prior to the Crucifixion was all the literal body and blood of Jesus? If so, did they also receive the grace of the sacrament at that time as well?