Fawcett M.D.Ĭonsider what the terms “transcribe” and “translate” mean in relation to language. Figure 168 from Chapter 5 (Endoplasmic Reticulum) of ‘The Cell, 2nd Ed.’ by Don W. The nucleus of the cell is in the upper left corner the RER in the lower half of the micrograph is stacked and studded with ribosomes. This cartoon also shows what can happen to protein after it is produced, which leaves the cell through vesicles.Įlectron micrograph of part of the nucleus and the rough endoplasmic reticulum (RER) in an acinar cell from the pancreas of the small brown bat, Myotis lucifugus. Cartoon image of the nucleus and rough ER (it is “rough” because ribosomes are attached to it). ![]() Below is a micrograph image that was taken of this area and the other is a cartoon representation. Transcription occurs in the nucleus and translation occurs outside of the nucleus at the ribosomes (which are either in the cytoplasm or attached to the rough endoplasmic reticulum. The mRNA leaves the nucleus and then, through the process of translation, the mRNA is read to create an amino acid sequence that folds into a protein. Note that DNA never “becomes” RNA rather, the DNA is “read” to make an RNA molecule. During the process of transcription-which occurs in the nucleus-an mRNA molecule is created by reading the DNA. There are two main processes that must occur to synthesize proteins: transcription and translation. ![]() The central dogma states that DNA is used to make RNA via transcription, which is used to make protein via translation.īecause proteins are coded by genes, the term “ gene expression” refers to protein synthesis (i.e., making proteins), including the regulationof that synthesis. We will learn about gene regulation in later chapters. In addition to DNA coding for RNA, much of the DNA regulates the synthesis of RNA- which ultimately means that it regulates the synthesis of protein. ![]() The central dogma of molecular biology is that DNA codes for RNA and RNA codes for protein.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |