Question

D Question 7 6 pts Regarding the serological test, which of the following are true statements: The test can potentially inform when social distancing is no longer needed because it detects how many people are already immune to the disease. The test can detect whether the infection is active or inactive The test gives false positives when exposed to dengue and other coronaviruses' antibodies. The test available shows fluorescence when antibodies present in blood extracted detect the spike protein of COVID19 outer coat.

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Answer 1

Except B , all other options are true regarding serological tests. Serological tests can inform us about any past infections but cannot be used to infer the status - active or inactive - of the infection.

Serological tests when done in enough quantities can be used as a strong indicator to judge the immunity status of the population. It can give information about the proportion of population which has acquired immunity against an infection and thus inform about social distancing measures.

Serological tests can give false positives in cases of dengue and corona viruses since they previou immunizations carried out in the body elicit antibodies in the blood and this can result in giving false positives.

The test available for COVID - 19 shows fluorescence when the antibodies present in blood detect the spike protein of COVID 19 outer coat. This serological test involves a PCR reaction.

Band X - Smallest DNA fragment that travels the fastest.

Throughout the gel, the pore size is same. So a molecule with small size will move faster through the gel (from top to bottom). Since X is at the bottom, in comparison to other bands, it is the smallest DNA fragment that travels the fastest.