ACROSS
2. mutation in which one or more nucleotides become inserted into DNA.
5. process by which a polypeptide chain is assembled from amino acids in the order specified by an mRNA.
7. RNA RNA that carries a protein-building message.
12. process in which enzymes assemble an RNA using a strand of DNA as a template.
13. chromosomal DNA sequence that encodes an RNA or protein product.

DOWN
1. in a tRNA, set of three nucleotides that base-pairs with an mRNA codon.
3. in an mRNA, a nucleotide base triplet that codes for an amino acid or stop signal during translation.
4. RNA RNA that delivers amino acids to a ribosome during translation.
6. RNA component of ribosomes.
8. nucleotide sequence that remains in an RNA after post-transcriptional modification.
9. mutation in which one or more nucleotides are lost.
10. in DNA, a sequence to which RNA polymerase binds.
11. nucleotide sequence that intervenes between exons and is removed during post-transcriptional modification.