BIOLOGY
PROTEINS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A ____ binds to an mRNA codon, the ____ ____ detaches from the tRNA molecule and attached to the growing (hydrogen or polypeptide) chain.
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tRNA molecule, amino acid
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rRNA molecule, amino acid
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tRNA molecule, ribosomal subunit
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rRNA, ribosomal subunit
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Explanation:
Detailed explanation-1: -How does tRNA bind to codons in the mRNA? The complementary bases on the codon and anticodon are held together by hydrogen bonds, the same type of bonds that hold together the nucleotides in DNA. The ribosome only allows the tRNA to bind to the mRNA if it is carrying an amino acid.
Detailed explanation-2: -The ribosome has three sites for tRNA binding, designated the P (peptidyl), A (aminoacyl), and E (exit) sites. The initiator methionyl tRNA is bound at the P site. The first step in elongation is the binding of the next aminoacyl tRNA to the A site by pairing with the second codon of the mRNA.
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