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WABiologyQuick questions
Unit 4: Surviving in a Changing Environment
Quick questions on The immune response: WACE Year 12 Biology
4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the first line of defence?Show answer
The first line is non-specific and acts to keep pathogens out. It includes physical and chemical barriers:
What is the second line of defence?Show answer
The second line is also non-specific (it does not target a particular pathogen) and acts quickly. It includes:
What is the third line of defence?Show answer
The third line is specific and adaptive, and slower to develop but powerful and long-lasting. It is triggered by antigens, molecules (often proteins) on the surface of a pathogen that the immune system recognises as foreign.
What is types of immunity?Show answer
Immunity can be classified by how it is acquired:
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