Question

how does intestinal juice contribute to the digestion of proteins? what provides an alkaline pH in the small intestine

Answer 1

The pepsin which digests protein, pepsin is a compound that separates proteins into smaller peptides (that is, a protease). It is created in the stomach and is one of the fundamental stomach related chemicals in the stomach digestive systems of human and numerous different creatures, where it helps process the proteins in food. 

Bile and pancreatic juices cause antacid PH in the digestive system. Bile assists with assimilation. It separates fats into unsaturated fats, which can be taken into the body by the digestive tract.