OBJECTIVE LIFE SCIENCE
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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If the DNA molecule with 6 paired nitrogen bases were transcribed, how many codons would the resulting mRNA molecule contain?
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1
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2
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3
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6
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Explanation:
Detailed explanation-1: -One amino acid is coded using six nitrogen bases. So the codon codes for the amino acid, requiring a total of six nitrogen bases.
Detailed explanation-2: -Methionine and tryptophan are the only two amino acids that are coded for by just a single codon (AUG and UGG, respectively). The other 18 amino acids are coded for by two to six codons. Because most of the 20 amino acids are coded for by more than one codon, the code is called degenerate.
Detailed explanation-3: -For example, six codons specify leucine, serine, and arginine, and four codons specify glycine, valine, proline, threonine, and alanine. Eight amino acids have two codons, whereas there is one codon each for methionine and tryptophan.
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