An important organelle is missing from this image of a eukaryotic cell undergoing protein synthesis. this organelle s not surrounded by a membrane but sits in the nucleus. it produces ribosomal subunits from proteins and ribosomal rna, which is exported into the cell proper. it is key to the process of protein synthesis taking place at ribosomes. what is this organelle?

1. seamount a raised footwall block between normal fault creates this 2. syncline break between rocks where a hanging wall rises relative to a footwall 3. hot spring on rolling hills, this a dip between hills 4. volcanic neck created when a block with hanging walls slips down between normal faults 5. caldera underwater volcano that never reaches above sea level 6. horst natural hot water on earth's surface containing many minerals 7. graben underwater volcano whose top is eroded flat by waves 8. crater less than a mile in diameter; looks like a bowl at the top of a volcano 9. guyot magma that filled the central vent that remains after the volcano has eroded 10. reverse fault over 1 mile in diameter; looks like a bowl over a volcano