HSC Biology — Module 7
Vaccination — Flashcards & Quiz
Vaccination trains the adaptive immune system to produce memory cells against a pathogen without causing disease, and it is one of the highest-frequency HSC Biology Module 7 exam topics. You need to explain the types of vaccines (live attenuated, inactivated, subunit, toxoid, mRNA), the mechanism of immunological memory, and the concept of herd immunity — plus evaluate the social, ethical and economic dimensions of vaccination programs.
Sample Flashcards
Q1: How do vaccines provide immunity?
Vaccines contain weakened, inactivated, or fragments of a pathogen (antigen). They stimulate the adaptive immune system to produce antibodies and memory cells WITHOUT causing disease. Upon future exposure, the memory cells respond rapidly, preventing illness.
Q2: What is herd immunity?
Herd immunity occurs when a large enough proportion of a population is immune (through vaccination or prior infection) that the disease cannot spread effectively, indirectly protecting those who are not immune (e.g. immunocompromised individuals, infants).
Sample Quiz Questions
Q1: Vaccines work by introducing a weakened or inactive form of a pathogen to stimulate the immune system.
Answer: TRUE
Vaccines expose the immune system to antigens (weakened, inactivated or fragments of pathogen) to trigger antibody production and memory cell formation without causing disease.
Q2: Herd immunity means every individual in a population must be vaccinated.
Answer: FALSE
Herd immunity does not require 100% vaccination. When a sufficient proportion is immune (typically 85-95%), the disease cannot spread effectively, protecting even unvaccinated individuals.
Related Concepts
Last updated: March 2026 · 2 flashcards · 2 quiz questions