THE MOLECULAR BASIS OF INHERITANCE
DNA MAKES RNA MAKES PROTEIN
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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ion
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exon
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intron
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codon
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Detailed explanation-1: -Codons. Cells decode mRNAs by reading their nucleotides in groups of three, called codons. Here are some features of codons: Most codons specify an amino acid. Three “stop” codons mark the end of a protein.
Detailed explanation-2: -A codon is a DNA or RNA sequence of three nucleotides (a trinucleotide) that forms a unit of genomic information encoding a particular amino acid or signaling the termination of protein synthesis (stop signals).
Detailed explanation-3: -Listen to pronunciation. (KOH-don) A sequence of three consecutive nucleotides in a DNA or RNA molecule that codes for a specific amino acid. Certain codons signal the start or end of translation.
Detailed explanation-4: -The three stop codons are TAG, TAA, and TGA in sense DNA, and UAG, UAA, and UGA in mRNA. TAG and UAG are called amber stop codons; TAA and UAA are known as ochre stop codons, and TGA and UGA are given the name of opal stop codons (or umber stop codons).
Detailed explanation-5: -There are 3 STOP codons in the genetic code-UAG, UAA, and UGA. These codons signal the end of the polypeptide chain during translation. These codons are also known as nonsense codons or termination codons as they do not code for an amino acid.