Describe the stages of phagocytosis (4 marks)
the phagocyte recognises the antigen on the pathogen surface as foreignThe phagocyte cytoplasm moves around the pathogen, and the membranes fuse, forming a phagosomeLysosomes containing lysozymes fuse with the phagocytic vacuole, lysozymes break down the pathogenThe phagocyte becomes antigen presenting to stimulate other immune system cells e.g T cells
AM
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All answers ▸Compare and contrast the structure of DNA and RNA (3 marks)
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DNA mismatch repair enzymes repair mainly bases on the newly synthesised DNA strand, using the old DNA strand as a template. If the mismatches were simply repaired without regard for which strand served as template, would this reduce replication errors ?