Collenchyma is a simple permanent tissue in plants. They are living cells with prominent nucleus and all the cell organelles. Each collenchymatous cell is with a large and prominent vacuole in the centre. The vacuole is filled with many secondary metabolites. Unlike parenchyma, the collenchyma cells possess thick primary cell […]
The tissue (a group of cells with particular function) composed of single type of cells. Three types of simple tissue system in plants, namely (1). Parenchyma, (2). Collenchyma and (3). Sclerenchyma. The present article discusses the Structure and Types of Parenchyma Cells in Plants. Characteristics of Parenchyma (Parenchymatous Cells) Ø Parenchyma […]
What is Epithelium? Ø Epithelium is a tissue system in animals. Ø Epithelium constitutes the outer layer of body surfaces, linings of the alimentary canal and the walls of hollow structures. Ø It covers the internal or external surfaces of the body. Ø Epithelial cells are held together by carbohydrate […]
Bonds involved in Protein Structure Proteins are the polymers of amino acids. Amino acids are joined together by a special type of covalent bond (peptide bond) to form linear structures called polypeptides. The polypeptides are then folded into specific structures to form the functional conformation of the protein. The folding […]
Classification of proteins: Proteins are important macromolecules of the cells, formed by the polymerization of amino acids according to the sequence of genetic code in the mRNA. Proteins are the mode of expression of the genetic information. They perform a variety of duties in the cells such as they act […]