About Tyrannosaurus. Tyrannosaurus is a large, bipedal carnivore that lived approximately 66 to 68 million years ago during the late Cretaceous Period. It is considered to be one of the largest carnivorous dinosaurs to have ever walked the Earth and its very name means âtyrant lizardâ. It was first discovered in 1902 by Barnum Brown.
Transcription. Definition. noun. It is the process of transcribing or making a copy of genetic information stored in a DNA strand into a complementary strand of RNA (messenger RNA or mRNA) with the aid of RNA polymerases.Supplement.t is the process of transcribing or making a copy of genetic information stored in a DNA strand into a complementary strand of RNA (messenger RNA or mRNA) with the aid of RNA polymerases.
The nucleus is the part of the eukaryotic cell that contains the cellâs 24 DNA molecules and is surrounded by a plasma membrane called the nuclear envelope. Transcription. Transcription is the process by which a cellâs nuclear DNA is transcribed into messenger RNA (mRNA). An enzyme called RNA polymerase starts at the opening sequence of a strand of DNA, called the promoter sequence, and then unwinds the DNA double helix little by little and transcribes that entire strand of DNA into mRNA.