Answer :
Answer:
B. DNA
Explanation:
The nucleus is the most prominent organelle in a cell. The nucleus (nuclei) houses the cells DNA and directs the synthesis of ribosomes and proteins.
The important structure which is housed in the nucleus and directs the day-to-day activities of a cell is DNA.
What do you mean by Nucleus?
A Nucleus may be defined as the usual round part of most cells that is enclosed in a double membrane, controls the activities of the cell, and contains the chromosomes.
The nucleus contains genetic material like DNA and RNA which are responsible for the synthesis of protein in the cytoplasm.
Therefore, the important structure which is housed in the nucleus and directs the day-to-day activities of a cell is DNA.
To learn more about the nucleus, refer to the link:
https://brainly.com/question/270276