HEREDITY
MUTATIONS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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How many amino acids are coded for by this sequence of nucleotides:ATG GGA ACT CCA
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4
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2
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6
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12
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Explanation:
Detailed explanation-1: -This leads to a total of 10 codons in the mRNA sequence AUGGCAGUGCCA as AUG, UGG, GGC, GCA, CAG, AGU, GUG, UGC, GCC, CCA.
Detailed explanation-2: -1. Three is the minimum number of nucleotides per codon needed to encode 20 amino acids. 4x4 = 16 amino acids. (i.e. 64 different combinations of four nucleotides taken three at a time).
Detailed explanation-3: -Because DNA consists of four different bases, and because there are three bases in a codon, and because 4 * 4 * 4 = 64, there are 64 possible patterns for a codon. Since there are only 20 possible amino acids, this means that there is some redundancy–several different codons can encode for the same amino acid.
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