What is the name of this commonly used scientific tool?

The  central dogma  of molecular biology is centered upon the process of protein synthesis, in which the information from dna is transcribed and translated, resulting in multiple amino acids being joined to form a)lipidsb)proteinsc)carbohydratesd)nucleic acids

When lactate builds up in a runners muscles it causes a burning sensation what causes this to occur

What processes take place before the mature mrna exits the nucleus?