Which of the following structures is consistent with a compound that displays a molecular ion peak at 103 and infrared signals at 2250 and 1600 cm-1? 
Definitions:
Rough ER
A part of the endoplasmic reticulum with ribosomes attached to its surface, involved in protein synthesis and folding.
Initiator tRNA
A specialized transfer RNA that is charged with the amino acid methionine in eukaryotes (or a formylmethionine in prokaryotes) and plays a crucial role in the initiation of protein synthesis.
Start Codon
The codon AUG, which signals the beginning of translation of messenger RNA. Compare with stop codon.
Assembly
The process of putting together various parts or elements to form a complete unit or system, often used in manufacturing and production contexts.
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