THE MOLECULAR BASIS OF INHERITANCE
DNA MAKES RNA MAKES PROTEIN
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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DNA
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mRNA
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tRNA
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rRNA
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Detailed explanation-1: -Each group of three bases in mRNA constitutes a codon, and each codon specifies a particular amino acid (hence, it is a triplet code). The mRNA sequence is thus used as a template to assemble-in order-the chain of amino acids that form a protein. Figure 2: The amino acids specified by each mRNA codon.
Detailed explanation-2: -An example of a codon is the sequence AUG, which specifies the amino acid methionine. The AUG codon, in addition to coding for methionine, is found at the beginning of every messenger RNA (mRNA) and indicates the start of a protein.
Detailed explanation-3: -(A) The small subunit and the mRNA bind to each other at the Shine-Dalgarno sequence. The start codon, AUG, is just downstream of this site. (B) The initiator tRNA becomes tagged with fMet and binds to the AUG codon on the mRNA.