Aqa Biology Immunity Exam Style Questions & answers 2023
Why are whole-cell vaccines better than vaccines containing parts of the bacterial cell? - ANSWER-1. Contains many different/greater range of antigens
2. Each antigen causes production of a specific antibody
Why may it lead to death ...
Why are whole-cell vaccines better than vaccines containing parts of the bacterial cell? - ANSWER-1.
Contains many different/greater range of antigens
2. Each antigen causes production of a specific antibody
Why may it lead to death if a person cannot product an immune response? - ANSWER-1. Infected by/
named disease cause by a pathogen
2. Pathogens reproduce / cause disease (in host)
3. Damage cells/tissues/organs
4. Release toxins
Why may a vaccine not be effective if the virus rapidly enter host cells? - ANSWER-1. (The virus enters
cells) before antibodies can bind to it/ destroy it
2. Antibodies cannot enter cells (to destroy)/ stay in blood
Why may a vaccine not be effective if a virus shows a lot of antigenic variability? - ANSWER-1. Antigen
on the virus changes
2. (specific) antibody can no longer bind to (new) antigen
What is a pathogen? - ANSWER-A microorganism that causes disease
Explain why antibodies are only effective against a specific pathogen? - ANSWER-1. Antigens are a
specific shape
2. Antibody fits/ binds/is complementary to antigen
Why would "...." cause an immune response? - ANSWER-Foreign (act as ) antigen/ non self
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