Once a strand of mRNA is made from the corresponding DNA template it is referred to as a primary transcript. In Eukaryotes, this primary transcript must first be modified before heading out into the harsh environment of the cytoplasm on its way to the ribosome. In the cytoplasm there are numerous digestive enzymes and other molecules that could interact with the mRNA molecule. In no more than three sentences, describe the modifications that must be made to a primary transcript before it can leave the nucleus as a secondary transcript.

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