OBJECTIVE LIFE SCIENCE
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A certain gene codes for a polypeptide that is 120 amino acids long. Approximately how many nucleotides long is the mRNA that codes for this polypeptide likely to be?
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360
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480
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40
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30
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Explanation:
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: -There will be four nucleotide-containing codons with less degeneracy in the genetic code for every 200 amino acids.
Detailed explanation-3: -The protein contains 120 amino acids. So, the mRNA must have at least 120 codons to code for a protein containing 120 amino acids. The correct answer is 120.
There is 1 question to complete.