Final answer:
Hemagglutinin is the flu protein that is an antigenic site. It binds to host receptors and facilitates the entry of the virus into host cells.
Step-by-step explanation:
The flu protein that is an antigenic site is hemagglutinin. Hemagglutinin is one of the two main antigens of the influenza virus, along with neuraminidase. These spike proteins play important roles in the viral infectious cycle. Hemagglutinin binds to host receptors and facilitates the entry of the virus into host cells.
Hemagglutinin is the protein on the influenza virus that acts as an antigenic site, eliciting a strong immune response.
The protein on the influenza virus that serves as an antigenic site is hemagglutinin. This is one of the two main spike proteins on the influenza virus's surface, which allows it to attach to and enter host cells. The antigenic properties of hemagglutinin are significant because they are recognized by the immune system and can elicit a strong immune response. However, due to the rapid antigenic changes in the influenza virus, new strains can often evade the immune system, making it a challenge to provide long-lasting immunity through vaccination. The flu protein that is an antigenic site is hemagglutinin. Hemagglutinin is one of the two main antigens of the influenza virus, along with neuraminidase. These spike proteins play important roles in the viral infectious cycle. Hemagglutinin binds to host receptors and facilitates the entry of the virus into host cells. Hemagglutinin is the protein on the influenza virus that acts as an antigenic site, eliciting a strong immune response.