Fractional distillation is the process in which the alkanes in petroleum can be partly separated. This is due to the petroleum having different boiling points. The process starts off with the heating of crude oil for it to vaporize. The vaporized crude oil is then fed into the bottom of the distillation tower. The resulting vapor rises through a vertical column. As the gases rises through the distillation tower, its temperature decreases. Thus, certain hydrocarbons begin to condense and run off at varying levels. Each level-specific condensed fraction contains hydrocarbon molecules that has a similar number of carbon atoms. These "cuts" of boiling point allow numerous hydrocarbons to be separated out in a single process. The cooling of the tower height allows for the separation. Subsequent to the refinement, individual fuels may undergo more refinement to remove existing contaminants or substances so as to improve the quality of the fuel through cracking.
I don’t know what a carry is but if you’re pushing, I guess that’s active since you’re using energy.
Answer:
1.) true
2.) False
Explanation:
1.) it does keep the prices inside the cell.
2.) proteins and phospholipids make up most of the membrane.
Hope this helps!
Answer:They are Monoculture, Polyculture and Monosex Culture.
Explanation:
Answer:
Transcription, 5' cap addition, addition of poly-A tail, exon splicing, passage through nuclear membrane
Explanation:
After being synthesized during the transcription, mRNA (pre-mRNA) must be modified in order to be functional (mature mRNA) and exported from the nucleus for the process of translation.Modification of pre-mRNA include:
- 5' capping-addition of 7-methylguanosine to the 5' end which protects the pre-mRNA
- addition of adenine residues to form a poly(A) tail whic is also with protective role (from ribonuclease digestion)
- RNA splicing-excision of introns and reconection of exons
Modified mRNA can now be transported from the nucleus into the cytoplasm.
