Answer: The correct answer for the fill in the blank is D. codon on the mRNA and the anticodon on the tRNA.
mRNA ( messenger RNA) carries information for the synthesis of proteins in the form of codon ( a sequence of 3 nucleotides that code for a particular amino acid). It is translated at the site called ribosomes.
During this process, tRNA ( transfer RNA) carries amino acid corresponding to the codon in the mRNA and it also carries three nucleotides in its anticodon region, which pairs with the complementary sequence in the mRNA.
The kind of amino acid, which is added to the growing polypeptide depends on the codon on the mRNA and the anticodon on the tRNA.
A trinucleotide sequence of RNA or DNA, which corresponds to specific amino acid is known as a codon. On the other hand, a trinucleotide sequence complementary to that of a corresponding codon in a mRNA sequence is known as an anticodon. It is found at one terminal of a transfer RNA molecule.
The information for the synthesis of proteins in the form of a codon is carried by an mRNA. In the process of translation, the transfer RNA carries the amino acid corresponding to the mRNA codon, and it also carries three nucleotides in its anticodon region that pairs with the complementary sequence in the mRNA.
Thus, the correct statement is option D.
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