Take this Quiz: GCSE Biology: Defences, Vaccination and Drugs | Zestly

Question 1

Which of the following are considered non-specific physical or chemical barriers that prevent pathogens from entering the human body?

Accepted Answer

Stomach acid

Question 2

What is the primary function of phagocytosis performed by white blood cells?

Accepted Answer

To engulf and digest invading pathogens

Question 3

How does a vaccination typically protect an individual from a future infection?

Accepted Answer

It introduces a dead or inactive form of the pathogen to trigger memory cell production

Question 4

Which of the following statements accurately describe the concept of herd immunity?

Answer

It occurs when a large proportion of the population is vaccinated, reducing the spread of the pathogen

Answer

It means that the pathogen has been completely eradicated from the planet

Answer

It protects individuals who cannot be vaccinated by reducing their chances of encountering the pathogen

Answer

It is a process where the body develops natural immunity without any medical intervention

Question 5

Why are antibiotics ineffective against viral infections like the common cold?

Answer

Viruses are too large for antibiotics to penetrate

Answer

Antibiotics only target the cell walls of fungi

Answer

Viruses reproduce inside host cells, where antibiotics cannot reach them

Answer

Antibiotics are only designed to kill human cells