:A variety of enzyme cofactors serving a wide range of chemical functions include NAD+ as part of their structure. In the cell, there are limited amounts of NAD+, which is derived from the vitamin niacin (Vit pp), a dietary requirement for human beings. Consequently, the recommended daily allowance for the vitamin niacin is 15 mg per day. How would glycolysis, citric acid cycle, fatty acid β-oxidation and amino acid deamination process be affected by niacin deficiency?