AQA- A LEVEL BIOLOGY EXAM QUESTIONS WITH CORRECT ANSWERS PROVIDED 2025/2026 EDITION
AQA- A LEVEL BIOLOGY EXAM QUESTIONS WITH CORRECT ANSWERS PROVIDED 2025/2026 EDITION what are killer t-cells? -- cytotoxic cells - bind to non-self antigens how to killer t-cells work? -1. virus attaches to and enters host cell 2. viral DNA causes host cell to express viral antigens on its surface 3. killer t-cells attaches to viral antigens on infected cells 4. killer t-cells induces death of infected cell (apoptosis) what is apoptosis? -programmed cell death how do killer t-cells destroy cancer? -- cancerous = mutations - mutations = abnormal antigens - killer t-cell binds to abnormal antigens - killer t-cells induces death of cancerous cell
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aqa a level biology exam questions with correct a