biology

2. a threadlike structure of nucleic acids and protein found in the nucleus of most living cells, carrying genetic information in the form of genes.
4. an adaptor molecule composed of RNA, typically 76 to 90 nucleotides in length
6. one of two strands of DNA found at the replication fork, or junction, in the double helix
12. Proteins are large biomolecules and macromolecules that comprise one or more long chains of amino acid residues.
14. the process of copying a segment of DNA into RNA
15. a segment of a DNA or RNA molecule containing information coding for a protein or peptide sequence
16. a polymer composed of two polynucleotide chains that coil around each other to form a double helix.
18. a class of enzymes thought to be vital to all organisms
19. a distinct sequence of nucleotides forming part of a chromosome
20. the material of which the chromosomes of organisms other than bacteria

1. In molecular biology, messenger ribonucleic acid is a single-stranded molecule of RNA
3. an alteration in the nucleic acid sequence of the genome of an organism
5. a sugar of the pentose class which occurs widely in nature as a constituent of nucleosides and several vitamins and enzymes
7. Amino acids are organic compounds that contain both amino and carboxylic acid functional groups
8. the positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass
9. a segment of a DNA or RNA molecule which does not code for proteins and interrupts the sequence of genes
10. the process in living cells in which proteins are produced using RNA molecules as templates
11. a compound consisting of a nucleoside linked to a phosphate group
13. a sequence of three nucleotides which together form a unit of genetic code in a DNA or RNA molecule
17. a single DNA strand that, during DNA replication