GED Science Practice

The structure in a cell's nucleus that contains hereditary material is the chromosome. Chromosomes are long, thread-like structures made of DNA and proteins, and they are responsible for the storage and transmission of genetic information. Each human cell typically contains 23 pairs of chromosomes, which carry the genes that determine hereditary traits.

In contrast, chloroplasts are organelles found in plant cells that conduct photosynthesis, converting sunlight into energy, but they do not contain hereditary material for cell division. Endoplasm refers to the cytoplasm found inside the cell, particularly in amoeboid cells, and is not directly related to genetic material. Endosomes are vesicles involved in the transport of materials within the cell after endocytosis, also unrelated to hereditary information. Therefore, the presence of chromosomes as the carriers of genetic material in the nucleus is what makes this choice the correct answer.