Examine the following diagram - VCE - SSCE Biology - Question 4 - 2012 - Paper 1

To identify what Structure X represents in the diagram, we need to analyze the components illustrated. The diagram resembles the structure of transfer RNA (tRNA), where each element plays a critical role in protein synthesis.

1. Understanding the Diagram: The structure depicted features an anticodon, which is indicative of tRNA. This suggests that Structure X is involved in transporting amino acids during protein synthesis.

2. Analyzing the Options: Given the choices:

   • A. DNA: DNA is a double-helix structure that stores genetic information, which does not fit the tRNA structure.
   • B. a vesicle: Vesicles are membrane-bound structures that transport materials within a cell, which does not apply here.
   • C. an amino acid: Amino acids are the building blocks of proteins; tRNA carries amino acids to the ribosome for protein synthesis.
   • D. three nucleotides: Although tRNA contains nucleotides, the specific representation of Structure X suggests it is the amino acid being represented.

3. Conclusion: Based on the analysis, the most suitable answer is C. an amino acid.