The neucleus and neucleolus because it's where DNA is retained and is where DNA undergoes the first steps of protien synthesis which is essential for life. As well as this without this organelle there'd be no-where to 'house' our DNA and without the genes in the DNA you, me and everyone wouldn't exist and neither would this question.
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The nucleus is often considered the most important organelle in a cell because it houses the cell's genetic material (DNA) and controls the cell's activities by regulating gene expression. It plays a crucial role in cell growth, reproduction, and overall function.
Mitochondrion
The nucleus is typically the structure in an animal cell with the largest volume. It houses the genetic material of the cell and is responsible for regulating gene expression and controlling cell functions.
The cell membrane.
The organelle most important for respiration is the mitochondria. Mitochondria are often referred to as the powerhouse of the cell because they are responsible for producing the energy currency of the cell, ATP, through the process of cellular respiration.
The nucleus is considered the most important structure for the health of a cell. It contains genetic material and controls cell activities. It regulates gene expression, cell division, and overall cellular function.