Can someone answer the follwing questions? Thank you in advance. 1) How is an im
ID: 259314 • Letter: C
Question
Can someone answer the follwing questions? Thank you in advance.
1) How is an immunofiltration assay different from an ELISA?
A) Test antigens are bound to filters rather than plastic plates.
B) Positive results are the result of precipitate formation.
C) Fluorescent molecules are attached to antigen rather than enzyme.
D) Antibodies are bound to filters rather than plastic plates.
E) They take longer than ELISAs.
2) A new virus is discovered that causes cells to lyse. Which of the following types of assay would be useful for diagnosing infection with this virus?
A) agglutination
B) complement fixation test
C) viral hemagglutination
D) both agglutination and complement fixation tests
E) viral neutralization
3) The presence of fungus in patient specimens can be detected by the ________ test.
A) direct fluorescent antibody
B) indirect fluorescent antibody
C) hemagglutination
D) complement fixation
E) ELISA
4) Which of the following tests does NOT detect an immune response to a virus infection?
A) a viral neutralization test
B) a direct immunofluorescent antibody test
C) a viral hemagglutination test
D) a complement fixation test
E) a direct ELISA
Explanation / Answer
1. In immunofiltration, the antibodies are bound to filters rather than the plastic plates. The filer is used to separate the antigens, then can't bind with the filter. Both immunofiltration and ELISA produce precipitates. Fluorescent molecules are attached to the enzymes in both case. The immunofiltration does not require many time. It is faster than the ELISA. So, option D is the correct choice here.
2. The virus causes cell lysis is mainly adenovirus. The adenovirus infection is mainly diagnosed by both the aggutination and complement fixation tests. Do, option D is the correct choice here.
3. Fungus produces fungal antigens. The antigens can be detected both by the direct ELISA or by the Indirect ELISA. So, the last option ELISA the right choice here.
4. A viral neutralization test does not detect the immune response to a virus infection. The test represent the presence of viruses not the immune response against it. Where as direct immunofluorescent antibody test represent the antibody level, indicates to the immune response. The viral hemaglutination test, complement fixation test and a direct ELISA also need the antibodies to detect the the immune response against the viruses. So, option A is the right choice here.