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Which of the following is not a part of the tRNA structure?

1. Variable loop
2. TeC stem
3. D stem
4. Scceptor stem
5. Kozak stem

Answer :

Transfer RNA (tRNA) is an important molecule in the process of translating genetic information from mRNA into proteins in cells. It has a distinct three-dimensional structure which includes several key parts:

  1. Variable Loop: This is a small region in tRNA whose size and composition can vary among different tRNA molecules. It plays a role in tRNA's interaction with the ribosome and mRNA.

  2. TψC (TeC) Stem: This part of tRNA contains the sequence ribothymidine-pseudouridine-cytidine (TψC). It is involved in the stabilization of the tRNA structure and the interaction with the ribosomal RNA.

  3. D Stem: The D stem contains dihydrouridine and is important for the overall folding of the tRNA molecule. It assists in the formation of the characteristic L-shape of tRNA.

  4. Acceptor Stem: This is the site on the tRNA where an amino acid is attached. It consists of the 5'- and 3'-ends of the tRNA molecule and is critical for the function of tRNA in protein synthesis.

None of these terms specifically mention a 'Kozak stem.' The Kozak sequence is actually related to the process of mRNA translation initiation in eukaryotes, not tRNA structure. Therefore, the correct answer to, 'Which of the following is not a part of the tRNA structure?' is:

  1. Kozak Stem

The lack of a 'Kozak stem' in the options specifies this as the correct choice for something not part of a tRNA structure.

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Rewritten by : Barada