DNA (deoxyribonucl eic acid) | Transcription is the first step of gene expression, in which a particular segment of DNA is copied into RNA (mRNA) by the enzyme RNA polymerase |
RNA transcription | a substance that carries genetic information in the cells of plants and animals |
Ribosomes | any of various round or long cellular organelles of most eukaryotes that are found outside the nucleus, produce energy for the cell through cellular respiration, and are rich in fats, proteins, and enzymes |
Mitochondria | any of the RNA-rich cytoplasmic granules that are sites of protein synthesis |