9. Number the statements below in proper order. _Amino acids are brought to the mRNA/ ribosome complex by tRNA.

_The DNA code is copied onto a single strand of mRNA by RNA polymerase.

_The completed polypeptide chain separates from the ribosome.

_The DNA double helix "zips” closed.

_mRNA forms a complex with a ribosome.

_tRNA attaches to an amino acid.

_Peptide bonds form between adjoining amino acids.

_The DNA double helix "unzips."

_mRNA leaves the nucleus and enters the cytoplasm.