Answer:
The correct answer would be -A pre-mRNA becomes mRNA by cutting out different introns
Explanation:
During the process of the RNA splicing, pre-mRNA has several specific segments of sequence that are identified by the spliceosome and then removed from the pre-mRNA. Specific parts that are removed are known as introns and the parts that stuck to become mRNA are exons.
Gene sequences in the eukaryotic genome can code for more than one protein due to removing the different introns every time to become mRNA from pre mRNA.
Here you go <span>Mitochondrial DNA can be traced for generations.</span>
The lithosphere is different than the hydrosphere in that the lithosphere refers to the part of the Earth that consists of the rocks, the surface, the upper mantle and the depth of the plates; whereas, the hydrosphere, from the word hydro- which means "water", this comprises the 71% of the Earth's surface which is covered with water.
7,8,6,5,4,3,2,1
Working backwards (to get the oldest), we have layer 1 forming first, then 2 above it, then 3. 4, 5, and 6 formed and then a fault caused the right side to slide down. 8 is intrusive, you can tell it's newer than 1, 2, 3, 4, 5, and 6 because it reaches all of those layers. You can tell 7 is the youngest layer because it formed after the fault (it's not split like 4, 5, and 6) and after 8's intrusion (because 8 doesn't reach it).
"doesn't reach it" means it isn't in that layer
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