Insulin. Insulin is a hormone made by the beta cells in the pancreas. It is the key that opens the doors of cells and allows glucose to get into the cell. Each cell needs glucose to function. Carbohydrates in food are broken down into glucose which enters the blood stream.
The pericycle is a cylinder of parenchyma or sclerenchyma cells that lies just inside the endodermis and is the outer most part of the stele of plants.
Peroxisomes in plants Peroxisomes present in germinating seeds convert fatty acids and lipids to sugars for metabolism. This metabolic cycle is called the glyoxylate cycle and the specialised peroxisomes in which it takes place are called a glyoxysomes.