Three isotopes of element X have been discovered. Sixty percent exists at 42 amu, 30 percent weighs 45 amu and the last 10% weighs 48 amu. What is the atomic mass?

It is a function of both DNA and RNA (mRNA)

Explanation:

In animal, plant and fungal cells, the direction for creating proteins and the structures where proteins are made to found in completely two different locations. DNA is stored in the nucleus, whereas the proteins are assembled from free amino acids in the cytoplasm structures known as ribosomes.A chemical messenger called mRNA is created in the nucleus and carries a duplicate of the DNA base sequence of a particular gene to the cytoplasm.Ribosomes attach to the mRNA and the directions it carries are used to assemble amino acids in the correct order to create a particular protein.