Interpreting molecule Y's biological role from experimental data

Steps:

• Analyze inhibition: Molecule Y stops organism X growth, confirming antibiotic function (✓).
• Evaluate origin: Results show organism X produces Y without self-harm, so "cannot be of X" is invalid (X).
• Assess synthesis: Y is a protein, translated from mRNA derived from DNA, applicable to human cells (✓).
• Match symbols: Only B correctly assigns ✓, X, ✓ to the statements.

Why B is correct:

• B aligns with central dogma of molecular biology: Proteins like Y are synthesized via DNA transcription to RNA and translation in eukaryotes including humans.

Why the others are wrong:

• A incorrectly marks second statement as ✗, ignoring X's production of Y.
• C wrongly denies antibiotic function and human synthesis.
• D mislabels antibiotic role and X origin.

Final answer: B