Based on your description, here is how you can associate the structures (V, U, X, Z) with their names and functions:
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Mitochondrion (V): This is the structure responsible for making energy for the cell through the process of cellular respiration.
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Golgi Apparatus (U): This structure is responsible for packaging and sorting proteins that are synthesized in the cell.
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Cell Membrane (X): This structure helps control what enters and exits the cell, acting as a selective barrier.
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Nucleus (Z): This structure holds the instructions for the cell in the form of DNA, containing the genetic information needed for cell function and replication.
Make sure to verify which letters correspond to which structures in your particular model, and feel free to alter the assignments based on the specific setup of your exam.