Question

Nissl's granules are present in them and are made up of respectively.
 A. Muscle cells and deoxyribonucleic acid
B. Mast cells and RNA
C. Osteocytes and DNA
D. Neuron and RER

Answer 1

Hint: It is believed that the functions of the Nissl bodies are similar to those of the remaining of the ER and the Golgi apparatus: the formation and release of proteins and amino acids.

Complete answer:
The ultrastructure of Nissl bodies suggests that they are firstly bothered with the formation of proteins for intracellular use.
A Nissl body, also called a Nissl or tigroid substance, is a large, granular body present in the nerve system. These granules are present in the concentrated rough endoplasmic reticulum (RER) with rosettes of free ribosomes and also responsible for the protein synthesis.
Nissl's granules are within the cytoplasm of the neuron and also with the cell organelles like mitochondria, nucleus, Golgi apparatus,etc.. These nissl granules give a colored like appearance to the cytoplasm of the cell body of the neutron. They are responsible for the synthesis of the proteins.

Additional information: Nissl bodies reappear after a successful repair. Chromatolysis means the vanishing of the Nissl bodies. This staining method is useful in locating the cell body, as can be seen in the soma and dendrites of neurons, but not in the axon or axonal mound. Due to the basophilic ("base magnet") properties of RNA, this method is colored blue.
Thus, the correct answer is ‘Neuron and RER’.

Note: The Nissl body is also known as the Nissl substance and Nissl material, it is a large granular body found in neurons. These granules are named the rough endoplasmic reticulum which in the form of rosettes of the free ribosomes. The rough endoplasmic reticulum helps in the synthesis of the proteins. Nissl bodies can be detected by a selective staining method developed by Nissl (Nissl staining), using an aniline stain to label the granules of foreign nuclear RNA.