Final answer:
The active coenzyme form of vitamin B6 is Pyridoxal phosphate (PLP), crucial for amino acid metabolism and essential for growth in infants.
Step-by-step explanation:
The active vitamin B6 coenzyme is Pyridoxal phosphate (PLP). This coenzyme is involved in a variety of important enzymatic reactions in the body, especially in amino acid metabolism. These reactions include transamination, decarboxylation, and deamination. PLP is derived from pyridoxine (vitamin B6) which can be found in sources such as yeast, rice polishings, milk, meat, eggs, leafy vegetables, and liver, and is essential for the growth of infants as well as other physiological functions.