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Questions tagged [genetic-code]

Tag for questions related to the set of three-letter combinations of nucleotides called codons, each of which corresponds to a specific amino acid or stop signal.

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Double stranded RNA Single stranded DNA

I have seen in textbooks referring to ds RNA and ssDNA. How a RNA can be double stranded and likewise how a DNA can single stranded and if they do exist why are there names not interchanged?
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2answers
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Are redundant codons used in translation?

I am learning about redundancy in genetics and I came across this statement in my textbook: more than one codon for an amino acid means that some codons are redundant - the process of protein ...
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1answer
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How are mitochondrial ATT (Ile) start codons translated as Methionine?

In some vertebrate species, some mtDNA start codon sequences are ATT but these are translated as Methionine rather than Isoleucine. What is the mechanism for this non-standard translation? The main ...
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0answers
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What kind of code is neural code? [closed]

It's rather clear and commonsensical what the genetic code is, how it is inscribed (as a sequence of nucleotides in the DNA), what it means, and most of all: how it is decoded and works. It's less ...
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1answer
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Biological terminology: “codes for” vs. “codes a” [closed]

Maybe this is answered already before, but I cannot find it: Most authors say/write "a gene codes for a protein", some use "a gene codes a protein". The latter seems to me the grammatically correct ...
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1answer
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Translation of Poly-U in the Nirenberg and Matthaei experiment

In the Nirenberg and Matthaei experiment the artificial mRNA, polyU, was translated into polyphenylalanine in a cell-free system, establishing that UUU was the codon for Phe. How did this work as the ...
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1answer
326 views

Evolution of the Redundancy of the Genetic Code

In short Looking at the genetic code, it appears that most redundancy is on the third letter rather than on the first or the second letter of the codon. Why has it evolved this way? Longer version ...
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1answer
751 views

Do alternative start codons code for methionine after transcription?

There is some literature which shows that all start codons code for methionine. However, in the standard genetic code, the alternative start codons clearly code for leucine. Does that mean these ...
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1answer
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Why do three nucleotides code for one amino acid? Why not 5 nucleotides? [duplicate]

We all know why there are 3-base codons, and why there aren't any 2-base codons. But why is there not a 4-base a 5-base codon?