Final answer:
The organelle DNA does not match the DNA found in the nucleus and is indicative of an endosymbiotic origin. Ribosomal RNA is synthesized in the nucleolus, and the nucleus contains DNA in an animal cell. The cytoplasmic membrane is a common structure among all life forms, suggesting a common cellular origin.
Step-by-step explanation:
Understanding Organelle DNA and Ribosome Synthesis
Organelle DNA is typically short and circular, and these sequences are distinct from the DNA found in the nucleus. For instance, DNA in mitochondria and chloroplasts resembles the DNA of prokaryotic organisms, which suggests a different evolutionary origin. This relates to the endosymbiotic theory, proposing that these organelles were once independent prokaryotic cells that developed a symbiotic relationship with eukaryotic cells.
The RNA components of ribosomes are synthesized in the nucleolus, a small dense spherical structure in the nucleus. This is where ribosomal RNA (rRNA) is transcribed and combined with proteins to form the subunits of ribosomes. These subunits then exit the nucleus to the cytoplasm where they are assembled into functional ribosomes.
In an animal cell, the organelle that contains the DNA is the nucleus, which is surrounded by two phospholipid bilayers, safeguarding this genetic material. Prokaryotes do not have a nucleus; their DNA is located in a central part of the cell called the nucleoid.
Looking at cell organelles that are common across different domains of life, the cytoplasmic membrane is one structure that points to a common origin among Archaea, Bacteria, and Eukarya. It is a fundamental component necessary for the very basis of what defines a cell: the separation of the internal environment from the external one.