Question

1. Which types of cells can produce memory cells? Select the TWO answers that are correct. B cells O cytotoxic T cells Oneutrophils macrophages O helper T cells 2. What must happen in order for a vaccine to confer immunity? Select the TWO answers that are correct. OThe vaccine should have the specific antibodies to the pathogen in it. O The vaccine should prompt the immune system to produce antibodies to the pathogen. O The vaccine will cause a mild form of the illness as the immune system responds to it. OThe vaccine must be made of a small amount of the live pathogen. The vaccine must contain some of the pathogen that has been killed or weakened. 3. What happens during antigenic drift? Select the TWO answers that are correct. Changes in the viral surface antigens make the virus unrecognizable by B memory cells. OTWO different viral strains exchange alleles inside a single host cell they have infected. O A new strain of virus that possesses different characteristics develops Very quickly A virus slowly accumulates mutations that make it easier for antibodies to detect it. Gradual changes caused by point mutations in the virus create a new variant. 4. What happens during antigenic shift? Select the TWO answers that are correct. Memory cells cannot recognize the surface antigens although the virus strain is the same. Two viral strains infecting the same host cell pass alleles to each other A new viral strain is produced that may infect a different animal or be more infectious. Mutations build up over time and gradually a new viral strain evolves. Slow changes take place in a viral strain's surface antigens as mutations accumulate.

Answer 1

1. Which types of cells TWO answers that are correct. can produce memory cells? Select the B cells O cytotoxic T cells Oneutrophils O macrophages helper T cells 2. What must happen in order for a vaccine to confer immunity? Select the TWO answers that are correct. OThe vaccine should have the specific antibodies to the pathogen in it. O The vaccine should prompt the immune system to produce antibodies to the pathogen. The vaccine will cause a mild form of the illness as the immune system responds to it. O The vaccine must be made of a small amount of the live pathogen. The vaccine must contain some of the pathogen that has been killed or weakened. 3. What happens during antigenic drift? Select the TWO answers that are correct. Changes in the viral surface antigens make the virus unrecognizable by B memory cells. OTWO different viral strains exchange alleles inside a single host cell they have infected. O A new strain of virus that possesses different characteristics develops Very quickly A virus slowly accumulates mutations that make it easier for antibodies to detect it. Gradual changes caused by point mutations in the virus create a new variant 4. What happens during antigenic shift? Select the TWO answers that are correct. Memory cells cannot recognize the surface antigens although the virus strain is the same. Two yiral strains infecting the same host cell pass alleles to each other new viral strain is produced that may infect a different animal or be more infectious. Mutations build up over time and gradually a new viral strain evolves. Slow changes take place in a viral strain's surface antigens as mutations accumulate.