Organelle means 'tiny organ' so you can think of cellular organelles as the organs of the cell which perform specific functions within the cell.
Mitochondria
I believe you are referring to the nucleus.
ribosomes
Endoplasmic Reticulum
It should be the vacuole, because all cells, even the red-blood cells and xylem cells have vacuoles. Basically my definition of "universal cell organelle" means an organelle which is present in all cells.
Nucleus is known as the "brain" of the cell?
Mitochondria
Golgi Apparatus
I believe you are referring to the nucleus.
it is a organelle called the mitochondrion
ribosomes
Endoplasmic Reticulum
Chloroplast is known as the kitchen of cell.
Mitochondria, it is known as the powerhouse of the cell and providing it energy.
It should be the vacuole, because all cells, even the red-blood cells and xylem cells have vacuoles. Basically my definition of "universal cell organelle" means an organelle which is present in all cells.
No it is not a cell.It is an cell organelle.
This organelle, in short description, is known as a mitochondrion (singular), or mitochondria (plural).