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Originally posted by Kr430n5_666

you cant hang around here....unless...

 

answer this...

 

What is a ribosome? What does it do?

 

correct answer will get you: nothing much. you actually dont have to answer this at all. where am i? thats right. huggable boxing bears. thanks.

 

hi.

 

Main Entry: ri·bo·some

Pronunciation: 'rI-b&-"sOm

Function: noun

Date: 1958

: any of the RNA-rich cytoplasmic granules that are sites of protein synthesis

 

ribosomes provide the structural site where the mRNA sits. The amino acids for the proteins are carried to the site by "transfer RNAs,". In the cartoon to the left, these are shown as blue molecules. Each transfer RNA (tRNA) has a nucleotide triplet which binds to the complementary sequence on the mRNA (see the three letters at the bottom of each molecule).

The tRNA carries the amino acid at its opposite end. One can trace and detect binding of a particular tRNA-amino acid complex to the mRNA by labeling that amino acid. It will bind to its tRNA. In the case to the left, Phenylalanine is bound to the tRNA which carries the complementary base code AAA (adenine-adenine-adenine). This triplet code would bind to the complementary sequence on mRNA UUU (uracil X3). The mRNA is shown as a green arrow. This cartoon shows the selective binding site on the mRNA which is attached in the ribosome. It also shows the tRNA carrying the Phenylalanine bound at the site In this particular assay which uses a polyuracil mRNA, only phenylalanine-bearing tRNA is bound and detected on the filter.

 

 

 

i cheated.

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