how is messenger RNA made and what is the relationship between messenger RNA and RNA?

Answer 1

Messenger RNA is transcribed from DNA through the process transcription.

mRNA is a subset of the group of RNA. The group of RNA consist of many different RNA. A few of them that I can remember would be rRNA, tRNA, siRNA and mRNA.

Answer 2

there is no plain RNA. it has to be mRNA, tRNA, or rRNA, so i can't answer the second question.

mRNA (messenger) is made by RNA polymerases that "unzip" the strands of DNA in the nucleus by breaking the hydrogen bonds between the base pairs. the polymerases then add nucleotides one by one, matching them to the nucleotides that are already there-- the "template". when finished, the mRNA strands detach and leave the nucleus.

Answer 3

here are some neat flash animations on mRNA:

Posttranscriptional Modification of mRNA
http://www.execulink.com/~ekimmel/mrna_flash.htm

Flash animation showing how mRNA, tRNA, and rRNA bind and function together to produce a tripeptide during Translation, the second phase of Protein Synthesis.
http://www.execulink.com/~ekimmel/translate.htm

See links under "Transcription and Translation" in:
http://science.nhmccd.edu/biol/bio1int.htm
http://science.nhmccd.edu/biol/ap1int.htm

see also
http://en.wikipedia.org/wiki/Protein_biosynthesis#Transcription
http://anthro.palomar.edu/biobasis/bio_5.htm