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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a protein that begins transcription by breaking apart hydrogen bonds
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a free-floating base that attaches to an open DNA strand
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the genetic code word of three bases on mRNA that specify one amino acid
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the strong bond between two complementary nitrogen bases
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Detailed explanation-1: -Definition. 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-2: -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-3: -Why do we have three-base-codons when it is possible to translate four-or five-base-codons? DNA only has 4 different letters: A, T, C, and G. But a protein can have 20 different amino acids. This is where codons come in-they help translate the DNA code into a protein code.
Detailed explanation-4: -Each group of three bases in mRNA constitutes a codon, and each codon specifies a particular amino acid (hence, it is a triplet code). The mRNA sequence is thus used as a template to assemble-in order-the chain of amino acids that form a protein.