Useful notes on the Origin of Endoplasmic Reticulum! At present the manner of origin of the endoplasmic reticulum is not definitely known. The most concrete hypothesis is that the ER is “budded” off from the nuclear envelope (Wischnitzer, 1974). Continuities between the nuclear envelope and ER have often been reported. Barer et al., (1959) found evidence that the nuclear envelope [...]
Chloroplasts: Notes on the Ultrastructure of Chloroplasts! The chloroplast which is a widely occurring plastid of green plants may be filamentous, saucer-shaped, spheroid, ovoid, discoid or club - shaped. It is vesicular, having a colourless centre. It's size varies from 2 to 3µ in thickness and 5 to 10µ long (Hall et al., 1974). In higher plants there are usually [...]
Four Kinds of Lysosomes are as follows: Lysosomes are polymorphic structures and according to present concept as described by De Robertis et al., (1971); this polymorphism is the result of the association of primary lysosomes with the different materials that are phagocytized (literally ‘eaten’) by the cell. Four Kids of Lysosomes: 1. Primary lysosome (storage granules): It is a small [...]
