All of the following are modes of action of antiviral drugs except:
a. Inhibition of protein synthesis at 70S ribosomes
b. Inhibition of DNA synthesis
c. Inhibition of RNA synthesis
d. Inhibition of uncoating
e. All of the above are modes of action of antiviral drugs

Verified step by step guidance

Step 1: Understand the context of antiviral drug action. Antiviral drugs target specific stages in the viral life cycle to prevent virus replication without harming the host cells significantly.

Step 2: Review common modes of action of antiviral drugs, which include inhibition of viral DNA synthesis, inhibition of viral RNA synthesis, and inhibition of viral uncoating processes.

Step 3: Analyze the option related to inhibition of protein synthesis at 70S ribosomes. Recall that 70S ribosomes are found in prokaryotes (bacteria), not in eukaryotic cells or viruses, which rely on host cell machinery (80S ribosomes) for protein synthesis.

Step 4: Conclude that since viruses use the host's 80S ribosomes for protein synthesis, antiviral drugs do not target 70S ribosomes, making this option inconsistent with known antiviral mechanisms.

Step 5: Therefore, identify the option that does not represent a mode of action of antiviral drugs by excluding the inhibition of protein synthesis at 70S ribosomes.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Antiviral Drug Mechanisms

Antiviral drugs target specific stages of the viral life cycle to inhibit replication. Common mechanisms include blocking viral DNA or RNA synthesis, preventing viral entry or uncoating, and inhibiting viral enzymes essential for replication.

Protein Synthesis in Viruses vs. Bacteria

Viruses rely on host cell machinery for protein synthesis and do not have their own ribosomes. In contrast, bacteria have 70S ribosomes, which are targets for some antibiotics but not antiviral drugs, making inhibition of 70S ribosomes irrelevant for antiviral action.

Viral Uncoating Process

Uncoating is the step where the viral capsid is removed to release viral genetic material inside the host cell. Some antiviral drugs inhibit this process, preventing the virus from replicating by blocking access to its genome.

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