{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

RNA and protein synthesi2

RNA and protein synthesi2 - = The identity of the...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
RNA and protein synthesis, the genetic code Transcription can be defined as the synthesis of a complementary strand of RNA from a DNA template (Tortora Fig 8.8) - There are three kinds of RNA is cells. In order of abundance, these are = ribosomal RNA (rRNA) is an important structural and functional component of ribosomes, the site of protein synthesis = transfer RNA (tRNA) is the "adapter" molecule that links nucleotide base sequence to amino acid sequence = messenger RNA (mRNA) encodes proteins - Although we tend to think of mRNAs in discussing transcription (since they then go on to be translated), synthesis of rRNAs and tRNAs occurs by the same mechanism - Synthesis of RNA by transcription is very similar to leading strand synthesis of DNA during replication = Free ribonucleotides are added to a growing strand in a 5' to 3' direction
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: = The identity of the nucleotides added is determined by base pairing with nucleotides in the DNA template strand = In RNA synthesis, uracil is added to a growing strand to pair with adenine, rather than thymine, which pairs with adenine in DNA- Only one strand of DNA in a given "gene" serves as the template- Transcription is catalyzed by the enzyme RNA polymerase- In addition to the sequence that is transcribed into an RNA sequence, the DNA sequence making up a gene contains additional information = The region where RNA polymerase binds to DNA to initiate transcription is known as the promoter site = The terminator site serves to signal the end point for transcription, where RNA polymerase is released from the DNA...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online