Final answer:
The nucleus functions as the control center of the eukaryotic cell; it contains DNA, regulates protein synthesis, and maintains cell function. The correct answer is option (a).
Step-by-step explanation:
The primary function of the nucleus is to act as the control center of the cell, containing the bulk of the cell’s genetic information and directing the manufacturing of proteins. The nucleus, a membrane-enclosed organelle found in eukaryotic cells, contains DNA in the form of chromosomes that are encoded with genetic instructions. These instructions are executed through the process of gene expression, determining the structure and function of the cell.
The nucleus maintains the integrity of genes and controls cell activities by regulating this gene expression. Within the nuclear envelope, the structure that houses the nucleus, material transport occurs through nuclear pores, allowing the necessary components for transcription and replication to move in and out.
The presence of the nucleolus within the nucleus is critical for ribosome synthesis. Although the nucleus is vital for cell function, not all cells contain a nucleus throughout their lifespan, such as red blood cells which eject their nucleus during maturation.
Based on the provided options and the function of the nucleus, the correct answer is a. Control center of the cell, contains DNA.