The correct answer is: A. Nucleus
A nucleus is a membrane-bound organelle found in eukaryotic cells that contains the cell’s genetic material. It is the control center of the cell and is responsible for regulating all cellular activities.
Prokaryotic cells do not have a nucleus. Instead, their genetic material is found in the cytoplasm, which is the jelly-like substance that fills the cell.
B. Cytoplasm is a jelly-like substance that fills the cell and contains all of the cell’s organelles, except for the nucleus. It is responsible for providing a medium for the movement of organelles and for carrying out metabolic reactions.
C. Ribosomes are small organelles that are found in both prokaryotic and eukaryotic cells. They are responsible for the synthesis of proteins.
D. DNA is a molecule that contains the genetic code of all living things. It is found in both prokaryotic and eukaryotic cells.