In this article we will discuss about the activation of amino acids and formation of aminoacyl-tRNA. The first step of protein biosynthesis comprises two reactions (see fig. 6-43) catalyzed, for a given amino acid, by one and the same enzyme called activation enzyme, or aminoacyl-tRNA synthetase, or aminoacyl-tRNA ligase. In a first step, the L-amino acid is activated by ATP [...]
The formation of flower or an inflorescence occurs during and after the transition of shoot apex to flowering phase. The introduction of scan electron microscope has greatly advanced the study of development of floral organs in a flower and floral primordia in an inflorescence. In an inflorescence apex a series of small, leaf-like primordia of involucral bracts appear first. Subsequently [...]
Get the answer of: How is the Pearl Formed ? Pearl is a valuable gem known to mankind since ancient times. The pearl, in fact, is of animal origin and produced by certain bivalves of Mollusca. The pearl producing bivalves are marine oysters of the genus Pinctada, though some freshwater bivalves of the genus Unio and Anodonta also produce pearl [...]