Use the following choices to answer questions 4 and 5:
a. Anti-Brucella
b. Brucella
c. Substrate for the enzyme
Which is the third step in a direct ELISA test?

검증된 단계별 안내

Understand the principle of a direct ELISA test: it involves detecting an antigen immobilized on a surface using a labeled antibody specific to that antigen.

Recall the sequence of steps in a direct ELISA: first, the antigen (in this case, Brucella) is attached to the well surface.

Second, a labeled antibody (anti-Brucella) is added, which binds directly to the antigen.

Third, after washing away unbound antibodies, a substrate for the enzyme linked to the antibody is added to produce a detectable signal.

Therefore, identify the third step as the addition of the substrate for the enzyme to develop the signal.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

영상 길이:

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Direct ELISA Procedure

Direct ELISA is an immunoassay technique used to detect the presence of an antigen in a sample. It involves immobilizing the antigen on a surface, then adding a labeled antibody that directly binds to the antigen. Understanding the sequence of steps—coating, blocking, antibody binding, and detection—is essential to identify the third step.

Role of Antibodies in ELISA

Antibodies are proteins that specifically bind to antigens. In direct ELISA, a labeled antibody (such as anti-Brucella if detecting Brucella antigen) binds directly to the target antigen. Recognizing the function and specificity of antibodies helps clarify which reagent is added at each step.

Enzyme-Substrate Reaction in ELISA Detection

The enzyme linked to the antibody catalyzes a reaction with a substrate to produce a detectable signal, usually a color change. This step follows antibody binding and is crucial for visualizing the presence of the antigen. Knowing when the substrate is added helps determine the order of ELISA steps.

Use the following choices to answer questions 4 and 5:a. Anti-Brucellab. Brucellac. Substrate for the enzymeWhich is the third step in a direct ELISA test?