Final answer:
Brush border enzymes involved in nucleic acid digestion in the small intestine include nucleosidase and phosphatase, which further break down nucleotides into absorbable components like nucleosides, nitrogenous bases, and pentose sugars.
Step-by-step explanation:
The brush border enzymes necessary for nucleic acid digestion found in the small intestine are specifically nucleosidase and phosphatase. These enzymes work together to further break down the nucleotides, which have already been partially digested by pancreatic enzymes like deoxyribonuclease and ribonuclease. The nucleosidase breaks the nucleotides into nucleosides and phosphate, and then nucleosidase further cleaves the nucleosides into nitrogenous bases and pentose sugars (ribose or deoxyribose). These breakdown products can then be absorbed through the alimentary canal wall into the bloodstream.