GENERAL HISTOLOGY

Detailed explanation-1: -Nucleolus is the structure composed inside the cell nucleus. Nucleus is responsible for the synthesis of proteins that make up ribosomes. Then these ribosomal proteins are assembled in the cytoplasm. Hence, ribosomal protein synthesis occurs in the nucleolus.

Detailed explanation-2: -rough endoplasmic reticulum (RER), series of connected flattened sacs, part of a continuous membrane organelle within the cytoplasm of eukaryotic cells, that plays a central role in the synthesis of proteins.

Detailed explanation-3: -The endoplasmic reticulum can either be smooth or rough, and in general its function is to produce proteins for the rest of the cell to function. The rough endoplasmic reticulum has on it ribosomes, which are small, round organelles whose function it is to make those proteins.

Detailed explanation-4: -Ribosomes are the sites in a cell in which protein synthesis takes place. Cells have many ribosomes, and the exact number depends on how active a particular cell is in synthesizing proteins. For example, rapidly growing cells usually have a large number of ribosomes (Figure 5).

Detailed explanation-5: -After the subunits enter the cytoplasm, they are assembled to form mature functional ribosomes. Therefore, proteins are formed in the cytoplasm of the cell, but not in the cell nucleus, because the nucleus does not contain mature ribosomes.