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Science Clinic => Biology => Topic started by: Yolanda on Jun 25, 2013

Title: There are 61 mRNA codons that specify an amino acid, but only 45 tRNAs. This is
Post by: Yolanda on Jun 25, 2013

There are 61 mRNA codons that specify an amino acid, but only 45 tRNAs. This is best explained by the fact that
A) some tRNAs have anticodons that recognize four or more different codons.
B) the rules for base pairing between the third base of a codon and tRNA are flexible.
C) many codons are never used, so the tRNAs that recognize them are dispensable.
D) the DNA codes for all 61 tRNAs but some are then destroyed.
E) competitive exclusion forces some tRNAs to be destroyed by nucleases.

Title: Re: There are 61 mRNA codons that specify an amino acid, but only 45 tRNAs. This is
Post by: coco on Jun 27, 2013

It's B. Have a nice day!

Title: Re: There are 61 mRNA codons that specify an amino acid, but only 45 tRNAs. This is
Post by: Yolanda on Jul 6, 2013

Thanks :D