The bottom loop of the tRNA molecule is called the ______. This sequence recognizes and pairs with the ______ on the mRNA.

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BlackTom AI · Accepted Answer

The question asks two linked ideas: first, the identity of the bottom loop of the tRNA molecule, and second, what that loop recognizes on the mRNA. 
Option 1: 'codon; promotor region' assigns the bottom loop to the codon and says it pairs with a promotor region on mRNA. This is incorrect because codons are on mRNA, not on tRNA, and the promotor region is a DNA element involved in transcription, not the pairing partner for tRNA. 
Option 2: 'anticodon; promotor region' correctly identifies the anticodon as the tRNA loop, but incorrectly states that it pairs with the promotor region. The promotor is unrelated to tRNA–mRNA base pairing and is a DNA sequence for transcription initiation, not a target for anticodon pairing. 
Option 3: 'amino acid binding site; codon' describes the aminoacyl end or acceptor stem of tRNA, which binds the amino acid, not the bottom loop, and then claims pairing with a codon. While the codon is the target on mRNA in principle, this option misplaces the functional region and misattributes the pairing partner, making it inaccurate. 
Option 4: 'anticodon; condon' (note the misspelling 'condon' instead of 'codon') correctly identifies the bottom loop as the anticodon. It also correctly states that this anticodon pairs with the codon on the mRNA, despite the typographical error in the word 'codon.' The scientific idea is sound, and no other option aligns with the established mechanism of tRNA–mRNA pairing. 
In summary, the bottom loop of tRNA is the anticodon, and it pairs with the codon on the mRNA. The only option that captures this relationship is the fourth one, even though it contains a spelling mistake. The presence of the misspelling does not alter the underlying concept being tested here, which is the anticodon–codon base pairing principle.

APBIO142-030 with labs 17.02 to 17.03 - Video Quiz

The bottom loop of the tRNA molecule is called the . This sequence recognizes and pairs with the on the mRNA.

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