Describe how phagocytosis of a virus leads to presentation of its antigens (3 marks)

Virus engulfed by phagocyte (broad immune response), destroyed using lysosomes (hydrolysis) and viral antigens presented on cell membrane (trigger specific immune response e.g. anti-bodies).
Steps of phagocytosis:
1.Phagosome/vesicle fuses with lysosome (1 mark)2.(Virus) destroyed by lysozymes/hydrolytic enzymes (1 mark)3.Peptides/antigen (from virus) are displayed on the cell membrane (1 mark)
Analogy to remember:Operates like packman
Exam technique:Emphasise importance of key terms e.g. "Fusion with phagosome", "Virus hydrolysed, "antigens on cell membrane" in achieving full marks in regard to A-level mark-schemes (e.g. AQA, OCR Edexcel).

BJ
Answered by Ben J. Biology tutor

26216 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

Name 2 forms of epigenetic modification, and explain the effect they have on the genotype.


What are three differences between DNA and RNA? ( 3 marks)


Explain the steps leading up to muscle contraction


What is the difference between a competitive and a non-competitive inhibitor?


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2025 by IXL Learning