The structure of molecules of mRNA and tRNA
mRNA is a single-stranded molecule that carries a copy of a gene's instructions. tRNA is a small molecule that reads those instructions and delivers the correct amino acid to build a protein.
Real World
The COVID-19 mRNA vaccines (Pfizer-BioNTech) work by introducing synthetic mRNA into human cells — the same single-stranded structure as natural mRNA — demonstrating how this molecule carries instructions that cells can read and act on.
Exam Focus
When asked to 'describe' tRNA structure, always state it is clover-leaf shaped with an anticodon loop and amino acid attachment site.
Evaluation Scaffold
A four-step framework for high-quality evaluation. Use this for 'assess', 'evaluate', and 'to what extent' questions.
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