Browning of cut apple is due to the oxidation of polyphenols at a particular pH to quinones, which further undergoes polymerization to form brown coloured tannins.
This browning reaction can be...
Columnar Epithelium:
Location: It is found in inner lining of intestine, gall bladder, gastric glands, intestinal glands, etc.
Structure:
1. The cells are tall, pillar-like. The inner ends of the cells are narrow while...