Determines how the cell will function, as well as the basic structure of the cell, it is additionally responsible for directing all cellular activity - serving as the 'brain' of the cell. Contains protien structures called chromosomes. Attached to chromosomes are genes which determine an individual's characteristics.

• A. Cytoplasm
• B. Cell Membrane
• C. Nucleus
• D. Organ

Answer: (C)

The nucleus acts as the control center, determining how the cell will function and directing all cellular activities. It houses the genetic material in chromosomes, with genes on those chromosomes providing the instructions for making proteins and regulating processes that shape how the cell operates and even influence traits in the organism. By controlling gene expression—transcribing DNA into RNA and guiding protein synthesis—the nucleus coordinates growth, responses to signals, and cell division. It’s enclosed by a double membrane with pores to regulate traffic, and the nucleolus inside helps make ribosomal RNA for protein production.

Other parts don’t fit because the cytoplasm is the site of many metabolic reactions and houses organelles, not the command center. The cell membrane controls what enters and leaves the cell, not the directing of cellular activities. An organ is a larger structure composed of tissues, not a component within a single cell.