A darkly stained body within a nucleus without any prominent membranous boundary is
Vacuole
Nucleolus
Ribosomes
Mitochondria
The Nucleus
The nucleus is the most prominent and important membrane bound organelle of the eukaryotic cell.
It is referred to as the brain of the cell because it contains the DNA which is responsible for carrying the information of various functions of the cell.
It was discovered by Robert Brown in 1831.
Nucleolus
The nucleolus is that region of the chromatin that codes for ribosomal RNA. These regions stain darkly in the resting (non-dividing) nucleus. There can be more than one nucleoli in the same nucleus.
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Nucleolus is that region of the chromatin that codes for ribosomal RNA. These regions stain darkly in the resting (non-dividing) nucleus.