Where does the assembly of ribosomes begin? nucleolus endoplasmic reticulum cyptoplasm

The first amino acid of a new polypeptide chain is

Explain how organisms could be harmed by high levels of salt from roadways?

Which best describes the nucleus of an atom a. it is where all of the particle s of the atom are located b. it is the negatively charged part of the atom c. it is where the electrons and the protons are located d. it is the part of the atom with the greatest mass