Question

influenza (the flu) is caused by a virus that attacks the respiratory system. which type of gene is most likely to be widely expressed in the body of someone who contracts the influenza virus?

the gene that controls the production of stem cells
the gene that controls the production of skin cells
the gene that controls the production of red blood cells
the gene that controls the production of white blood cells

Explanation:

When a person contracts the influenza virus, the immune system responds. White blood cells are crucial in the immune response. Stem cells differentiate into various cell types but their production gene isn't directly related to fighting the flu. Skin cells are part of the integumentary system (not directly involved in immune response against flu). Red blood cells carry oxygen. White blood cells (like lymphocytes, macrophages etc.) are actively involved in immune defense against pathogens like the influenza virus. So the gene controlling white blood cell production would be more widely expressed.

Answer:

the gene that controls the production of white blood cells