Friday, February 12, 2010

True or False? A gene may encode information needed by a cell to produce mRNA and tRNA but not rRNA?

false...a gene only encodes mRNA which can be translated into a protein. tRNA and rRNA are both non-coding RNA species that serve structural and catalytic roles in protein synthesis (translation)True or False? A gene may encode information needed by a cell to produce mRNA and tRNA but not rRNA?
False.





ALL RNA are encoded, or transcribed, from DNA (genes),


mRNA are RNA that are used to translate into proteins.


tRNA are RNA that are used to transport amino acids.


rRNA form ribosomes that is used for docking amino acid chains.





mRNA, tRNA and rRNA differ only in function not composition (nucleic acids) or origin.True or False? A gene may encode information needed by a cell to produce mRNA and tRNA but not rRNA?
True, messenger RNA makes a copy of the gene on the DNA and then goes to the ribosome where amino acids on transfer RNAs corresponding to the codes on the mRNA are added to form a chain ie protein.





Ribosomal RNAs are formed by a different process unrelated to DNA.
FALSE- Many RNAs do not code for protein however. These non-coding RNAs can be encoded by their own genes (RNA genes), but can also derive from mRNA introns. The most prominent examples of non-coding RNAs are transfer RNA (tRNA) and ribosomal RNA (rRNA), both of which are involved in the process of translation.

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