Final answer:
The nucleus is the structure that includes all others: nucleolus, chromosomes, and genes. Within the nucleus, chromosomes are DNA wrapped around proteins holding genes, and the nucleolus is responsible for ribosome creation.
Step-by-step explanation:
The question you've asked relates to the hierarchy of cellular structures, specifically within the nucleus of eukaryotic cells. The structure that includes all the others—nucleolus, chromosomes, and genes—is the nucleus. To understand this, we need to recognize that inside of the nucleus, you will find the chromosomes, which are strands of DNA wrapped around proteins. Genes, which are segments of DNA that contain the code for the creation of a protein, are located on these chromosomes. The nucleus of many cells also contains the nucleolus, an area within the nucleus responsible for assembling ribosomal subunits from ribosomal RNA and proteins.
Summary:
- The nucleus contains the genetic material of the cell.
- Chromosomes, which are made up of DNA and proteins, reside within the nucleus and contain genes.
- The nucleolus, also inside the nucleus, is responsible for the creation of ribosomes.