BIOLOGY
NUCLEIC ACIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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30
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40
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360
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480
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Detailed explanation-1: -Answer and Explanation: The correct answer is a. 360 nucleotides and 120 codons. Since each codon specifies one amino acid, the number of codons is equal to the number of amino acids.
Detailed explanation-2: -Expert-Verified Answer. If one gene codes a polypeptide containing 120 amino acids long, then 360 nucleotides will be needed in the mRNA to code for this polypeptide (Option C). During gene transcription, a specific sequence of DNA called ‘gene’ is used as a template to create a messenger RNA (mRNA).
Detailed explanation-3: -The codons of the mRNA are read and translated to produce a polypeptide. If 3 nucleotides (a codon) code for 1 amino acid, then the number of nucleotides required for coding 100 amino acids = 100 * 3 = 300.
Detailed explanation-4: -Thus, a polypeptide having 50 amino acids shall be specified by a linear sequence of 150 nucleotides. Therefore, option d) is correct. Q.
Detailed explanation-5: -Three is the minimum number of nucleotides per codon needed to encode 20 amino acids.