History of RNA

	Revision 15 . . (edit) December 10, 2001 6:21 pm by Malcolm Farmer
	Revision 14 . . December 10, 2001 2:39 am by Bryan Derksen [changed numbering on the RNA lifecycle]
	Revision 13 . . December 9, 2001 7:10 pm by (logged).234.79.xxx [*merge much duplication between this article and "Messenger RNA"]
	Revision 12 . . (edit) December 1, 2001 3:06 am by Magnus Manske
	Revision 11 . . (edit) October 12, 2001 12:55 am by Sodium

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Difference (from prior major revision) (minor diff, author diff)

Changed: 1c1

Ribonucleic acid, a nucleic acid structurally distinguised from DNA by the presence of an additional oxygen atom attached to the each pentose ring, and functionally distinguished by its multiple roles in the intracellular transmission of genetic information from the site of transcription (from DNA) to the site of translation (into protein).

Ribonucleic acid, a nucleic acid structurally distinguished from DNA by the presence of an additional oxygen atom attached to each pentose ring, and functionally distinguished by its multiple roles in the intracellular transmission of genetic information from the site of transcription (from DNA) to the site of translation (into protein).

Changed: 3c3

RNA has four different bases; adenine?, guanine, cytosine, and uracil?. The first three bases are the same as those found in DNA, but uracil replaces thymine? as the complementary base to adenine. There are three main varieties of RNA found in all living cells:

RNA has four different bases; adenine?, guanine, cytosine, and uracil?. The first three bases are the same as those found in DNA, but uracil replaces thymine? as the complementary base to adenine. There are three main varieties of RNA found in all living cells:

Changed: 7c7

*Ribosomal RNA, abbreviated rRNA, is the primary constituant of ribosomes. Ribosomes are the protein-manufacturing organelles of living cells, and exist in the cell's cytoplasm. rRNA is transcribed from DNA like all RNA, and in eukaryotes it is processed in the nucleolus before being transported through the [nuclear membrane]?.

*Ribosomal RNA, abbreviated rRNA, is the primary constituent of ribosomes. Ribosomes are the protein-manufacturing organelles of living cells, and exist in the cell's cytoplasm. rRNA is transcribed from DNA like all RNA, and in eukaryotes it is processed in the nucleolus before being transported through the [nuclear membrane]?.

Changed: 15,24c15,19

#a gene from the DNA to mRNA on demand. In eukaryotes, this copy #(called primary transcript or precursor mRNA) is #spliced to remove introns (certain genetic sequences #unwanted in protein biosynthesis). In prokaryotes, mRNA is generally #not spliced. Also only in eukaryotes, the mRNA is then exported from the #nucleus through special structures in the nuclear membrane #known as nuclear pores. Ribosomes read the mRNA and produce the #according polypeptide (or protein) in a process called #translation. Finally, the mRNA is disassembled into its #nucleotides.

#a gene from the DNA to mRNA on demand. In eukaryotes, this copy (called primary transcript or precursor mRNA) is #spliced to remove introns (certain genetic sequences unwanted in protein biosynthesis). In prokaryotes, mRNA is generally not spliced. Also only in eukaryotes, the mRNA is then #exported from the nucleus through special structures in the nuclear membrane known as nuclear pores. #Ribosomes read the mRNA and produce the according polypeptide (or protein) in a process called translation. Finally, #the mRNA is disassembled into its nucleotides by RNAses.

Changed: 40c35

:See also : genetics

:See also : genetics