In this article we will discuss about the structure and functions of nucleolus. Structure of Nucleolus: Estable and Sotelo (1951) described the structure of a nucleolus under the light microscope. According to them, nucleolus consists of a continuous coiled filament called the nucleolonema embedded in a homogenous matrix, the pars amorpha. The first description of nucleolar ultra structure was given [...]
In this article we will discuss about:- 1. Meaning of Protoplasm 2. Physical Nature of Protoplasm 3. Chemical Nature. Meaning of Protoplasm: The "living structure" present inside the cell referred to as protoplasm differentiates the living beings from the non-living beings. Huxley (1868) defined it as "Physical basis of life". First of all, Felix Dujardin (1835) described this homogenous jelly [...]
The following points highlight the eight chief metabolically active cell organelles of cytoplasm. The organelles are: 1. Plastids 2. Mitochondria 3. Endoplasmic Reticulum 4. Golgi Bodies 5. Ribosomes 6. Centrosome 7. Lomasomes 8. Microtubules. Organelle # 1. Plastids: The term 'plastid' was firstly used by Haekel (1866). These are the largest bodies or largest cytoplasmic organelles of a plant cell. [...]