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Question 19N.3.HL.TZ0.12c

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.3.HL.TZ0.12c
Level HL Paper 3 Time zone TZ0
Command term Outline Question number c Adapted from N/A
c.
[Maximum mark: 2]
19N.3.HL.TZ0.12c
(c)

Outline the main principles of the Enzyme-Linked Immunosorbent Assays (ELISA) test.

[2]

Markscheme

a. «ELISA» uses antibodies to detect a target antigen «to a pathogen» ✔ OWTTE

b. antigen attached to substrate ✔

c. the antibody «if present» will attach to the antigen ✔

d. «suitable» enzyme attached to antibody ✔

e. «enzyme» colour reaction shows the presence of antibodies to the antigen/pathogen ✔

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