Question

acute intermittent porphyria, a debilitatingly painful genetic disease, is caused by the cellular release of harmful proteins prompted by abnormalities in dna, or deoxyribonucleic acid. ribonucleic acid, or rna, acts as a messenger between cells, and long ago, pharmaceutical engineers realized that if rna did not reach cells to signal the dna, those harmful proteins would not be released. there are natural occurrences of rna destruction, but it took many years to create gene - silencing drugs to intentionally kill messenger rna in porphyria patients. early results are very promising, and scientists hope to demonstrate that the process can be used to remedy other genetic conditions.
the medication
the protein release.

○ disregarded
○ augmented
○ precluded
○ simulated

Explanation:

To solve this, we analyze the context: The disease is caused by harmful protein release triggered by RNA signaling. The medication (gene - silencing drugs) kills messenger RNA. So we need a word that means the medication stops the protein release.

• "disregarded" means to ignore, which doesn't fit as the medication acts on protein release, not ignore it.
• "augmented" means to increase, but we need to stop the release, so this is wrong.
• "precluded" means to prevent or make impossible. Since the drug kills RNA, it prevents the protein release (because RNA signals for protein release).
• "simulated" means to imitate, which has nothing to do with stopping protein release.

Answer:

precluded