GENERAL HISTOLOGY

Detailed explanation-1: -Nucleus is responsible for the synthesis of proteins that make up ribosomes. Then these ribosomal proteins are assembled in the cytoplasm.

Detailed explanation-2: -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-3: -Ribosomes are found in plant and animal cells and are made up of protein and ribosomal RNA. They can be either free or attached. Ribosomes are located in the cytoplasm, on the surface of the endoplasmic reticulum, the mitochondria, and the chloroplasts. The job of ribosomes is to synthesize (or build) protein.

Detailed explanation-4: -Explanation : Nucleolus is a darkly pigmented portion of nucleus . It produces rRNA which moves from there to cytoplasm and join with proteins to form ribosomes. So it concludes that nucleolus is the portion of cell which forms ribosomes.

Detailed explanation-5: -In all multicellular organisms, the 70S ribosomes are found in mitochondria which is present in the cell of every organism including plants and animals.