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