Which organelle is known as the largest in eukaryotic cells and directs cellular activities?

The nucleus is indeed recognized as the largest organelle in eukaryotic cells and serves as the command center for cellular activities. It houses the cell's genetic material in the form of DNA, which is organized into chromosomes. The nucleus plays a crucial role in regulating gene expression and therefore controls the synthesis of proteins, which are essential for various cellular functions.

Within the nucleus, processes such as transcription (the first step of protein synthesis) occur, where messenger RNA is synthesized based on the DNA template. The nucleus is surrounded by a double membrane called the nuclear envelope, which contains nuclear pores that allow for selective transport of molecules in and out of the nucleus, such as RNA and ribosomal proteins.

The other organelles, while significant for cellular function, do not serve the same overarching regulatory role as the nucleus. Ribosomes are involved in protein synthesis but lack DNA and do not direct cellular activities. Mitochondria are known as the powerhouses of the cell and are primarily responsible for energy production through cellular respiration. The endoplasmic reticulum aids in the synthesis and transport of proteins and lipids but operates under the regulatory instructions provided by the nucleus. Thus, the nucleus is essential for directing and coordinating the life processes of eukaryotic