Which of the following is true when interferon attaches to a cell?

• A. It triggers the production of antiviral proteins.
• B. It directly destroys viral particles.
• C. It increases the cell's permeability to viruses.
• D. It inhibits the cell's ability to produce proteins.

Answer: (A)

Verified step by step guidance

1. Understand the role of interferons: Interferons are proteins that are part of the immune response, primarily involved in defending against viral infections.
2. Identify the mechanism of action: When interferons attach to a cell, they do not directly destroy viral particles or increase the cell's permeability to viruses.
3. Focus on antiviral protein production: Interferons trigger the production of antiviral proteins within the cell, which help inhibit viral replication.
4. Eliminate incorrect options: Since interferons do not directly destroy viruses or increase permeability, and they do not inhibit the cell's ability to produce proteins, these options can be ruled out.
5. Conclude with the correct action: The primary action of interferons is to stimulate the production of antiviral proteins, which is the correct answer.