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Questions tagged [codon]

Tag for questions relating to the sequence of three DNA or RNA nucleotides that corresponds with a specific amino acid or stop signal during protein synthesis. DNA and RNA molecules are written in a language of four nucleotides; meanwhile, the language of proteins includes 20 amino acids.

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Are STOP codons impacted by base insertion or deletion mutation?

I am learning about base insertion and deletion mutations. An example in my textbook is given below. GUU CCA CAU AUC. So if there is an insertion (of guanine): GUU GCC ACA UAU C_ _ (there will be a ...
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2answers
95 views

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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2answers
95 views

Insertion of an additional base at start codon make the protein still functional?

So the question is if: a deletion of a codon for the amino acid lysine (AAG) is more or less likely to cause nonfunctionality of the protein than: Insertion of an additional base (C) within the ...
4
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2answers
145 views

DNA code and codon

I work as a highschool teacher and I believe that in most highschool textbooks in my country there is a lost-in-translation problem involving some molecular biology basics. It has spread to the point ...
1
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1answer
53 views

History of ideas about the form of the genetic code

In preparing a lecture on mRNA translation and the genetic code, I remembered a talk given at a symposium where they mentioned the origin of the code and how, before the code was established, various ...
4
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2answers
3k views

How many possible codons?

Consider a codon of the form NNK (where N = Adenine, Cytosine, Guanine or Uracil & K = Uracil or Guanine). How many codons are now available? I know if all were available there would be 4^3 = 64 ...
3
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2answers
108 views

Examples of heterologous expression in human cell beside viral expression

Usually, people are interested in expressing human proteins in fast-growing organisms like bacteria to yield a maximum of protein within a short time lapse. Codon usage harmonization/optimization have ...
4
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2answers
3k views

Why are there six reading frames if only one strand of DNA is referred to as the ‘coding strand’?

We need to consider six reading frames when considering the potential of DNA to encode protein (three frames for each strand). But only one strand is transcribed into RNA — the so-called coding strand....
2
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1answer
271 views

Will a Codon result in same amino acid across organisms [duplicate]

Will all organisms with the same 3 nucleotide sequence in the codon produce the same exact same amino acid. I read that the three nucleotide sequence will code for a particular amino acid. I did not ...
3
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2answers
483 views

Codon tables and the wobble hypothesis

In E. coli, there are only 47 different tRNAs but 61 potential anticodons. This is because, from what I understand, the third base of the anticodon can pair by wobble rules. However, it is known that ...
3
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1answer
936 views

Is it possible to have multiple stop codons in one exon?

I would be very happy if someone can help me to find the answers for the following related questions. Can one exon have many stop codons? Can protein synthesis happen, if the stop codon is at the ...
2
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1answer
158 views

Does GC content determine codon bias or does codon bias determine GC content

I was wondering if someone knows the answer to this quenstion, because I can't find a clear answer, maybe there isn't a clear answer :). question Which of these two is right? or maybe both influence ...
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1answer
243 views

Relationship of bases in a gene to amino acids

One of my study questions for a biology test was: A gene contains 1200 bases. How many codons will be on the mRNA immediately after transcription? My initial answer was 400 codons, because 1200 ...
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2answers
14k views

Stop codons and exons?

If we had a hypotheical gene called gene exampleGene and this gene had 5 exons, labeled A, B, C, D, and E in that order on the chromosome, could it be the case that the stop codon for this gene be on ...
13
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2answers
324 views

Are codons that map to the same amino acids interchangeable?

From wikipedia, in the section on the RNA codon table, I see a mapping between codons and amino acids. There, Valine is related to GUU, GUA, GUG, GUC. Does it mean in the same context that these ...
3
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0answers
35 views

Inter-codon mutations statistical analysis

I am looking for a statistical approach to inter-codon mutations. For example a 64*64 (64*63 actually) table, that contain the possibility of mutation from one codon to another codon (CCA to CAA or ...