Question

When exposure to a pathogen identical to one that has been encountered previously occurs again, the immune system recognizes the pathogen and acts quickly based upon:

Answer 1

PAMPs (Pathogen Associated Molecular Patterns)

Step-by-step explanation:

• The PAMPs are "markers" on the pathogen that the body's immune cells will recognize via the PAMP recognition receptors (PRRs).
• The memory cells of the body will recognize the pathogen faster because these cells have a 'memory' of the pathogen and can initiate a faster, more robust response.