What Is the Principle of Direct Antigen Testing

question 16

Multiple Choice

What is the principle of direct antigen testing?

• A) A clinical specimen is mixed with an antigen, then a labeled antibody is added. If the antigen is present, a complex will form.
• B) It is a process by which microbial antigens are identified in patient specimens by combining specifically with antibody molecules to form stable complexes.
• C) A fluorescent antigen is added to a specimen, then an antibody to form sandwich complexes.
• D) Labeled antigen is added to a specimen, and the specimen is read for fluorescence.

---

Definitions:

Dominant Allele

An allele that is always expressed when it is present, regardless of whether it is homozygous or heterozygous. Compare with recessive allele.

Aa Genotypes

A term referring to individuals with a heterozygous genotype, possessing two different alleles (A and a) at a single genetic locus.

Frequency

In physics, the number of occurrences of a repeating event per unit of time, often used to describe waves or vibrations.

Dd Genotype

A genetic constitution in an organism where D and d represent different alleles of a gene, with Dd being a heterozygous genotype.