How many coding codons are there? Does one amino acid have one codon? Can one tR
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How many coding codons are there? Does one amino acid have one codon? Can one tRNA recognize more than one codon? Can an amino acid be recognized by more than one type of tRNAs? (look at the genetic code table to find the answer don't memorize genetic code- but you will have to know the e- sequences of stop and start codons). A protein has an isoelectric pH of 6. What will be its charge at pH 11? How can you separate GC rich DNA from AT rich DNA? Which step is the most important step in gene regulation?Explanation / Answer
107. There are 61 coding codons.
Explanation: There are 4 nucleotides and the codon is made up of 3 nucleotides. Hence there would be 4x4x4=64 combinations. Of these 3 are stop codons. Hence there are 64-3=61 codons which encode an amino acid.
One amino acid can have more than one codon.
Explanation: Codons are degenerate, meaning amino acids can be encoded by more than one codon (except for methionine (AUG) and tryptophan (UGG) which are encoded by one codon). This is because the first two nucleotides are sufficient to specify the amino acid and substitution of the nucleotide in the third position may not result in change in amino acid. For example GCN encodes for alanine, where any nucleotide (abbreviated as N) in the third position of the codon would still encode alanine.
Yes, an amino acid can be recognized by more than one tRNA.
Explanation: THe tRNA has an anticodon sequence which pairs with the complementry codon sequence. Some amino acids are recognised by more one tRNA and some tRNA strongly bind only to only two base pairs of the codon and may have a wobble in the first position of the anticodon.
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