Reverse transcriptase polymerase chain reaction

Real time polymerase chain reaction

Raised time polymerase chain reaction

UPPSC-2021

Applied Microbiology & Infection control

Easy

RTPCR term denotes?

Appeared in: UPPSC-2021

Explanation

The correct full form of RT-PCR is Reverse Transcriptase Polymerase Chain Reaction.
The 'RT' specifically refers to the enzyme 'Reverse Transcriptase', which is essential for the first step of the process.
This enzyme synthesizes a strand of complementary DNA (cDNA) from an RNA template.
This initial conversion is necessary because the standard Polymerase Chain Reaction (PCR) can only amplify DNA, not RNA.
Therefore, RT-PCR is the designated method for detecting RNA-based genetic material.

Option A: This is a common point of confusion. 'Real-time PCR' is a different technique, also known as quantitative PCR (qPCR). While the two are often combined (as qRT-PCR), the 'RT' in the standalone acronym RT-PCR specifically denotes 'Reverse Transcriptase'.
Option C: 'Raised time' is not a recognized term in molecular biology or in the context of PCR. This option is scientifically meaningless.
Option D: This option is incorrect because a correct definition is provided in the options.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Definition and principle of Reverse Transcriptase Polymerase Chain Reaction (RT-PCR) as background academic context rather than a clinical decision trigger.
RT-PCR is the gold standard for diagnosing active infections caused by RNA viruses, including SARS-CoV-2 (COVID-19), HIV, influenza, and hepatitis C.
It allows for very early detection of infection, even before the body has produced a detectable antibody response.
In research, RT-PCR is vital for gene expression analysis, helping scientists understand which genes are active in a cell at a particular time.

How to Approach the Question

First, identify the core of the question, which is to define the acronym 'RTPCR'.
Recognize that this acronym is a common source of confusion in molecular diagnostics.
Break down the potential meanings. 'R' could be 'Real' or 'Reverse'. 'T' is 'time' or 'transcriptase'. 'PCR' is Polymerase Chain Reaction.
Recall the fundamental purpose of the technique. It's used for RNA viruses. PCR works on DNA. Therefore, a step must exist to convert RNA to DNA.
The enzyme that converts RNA to DNA is 'Reverse Transcriptase'. This strongly suggests 'RT' stands for 'Reverse Transcriptase'.
Evaluate the options. Option B, 'Reverse transcriptase polymerase chain reaction', directly matches this reasoning. Option A, 'Real time...', is a known, but different, technique (qPCR). Option C is nonsensical. Therefore, Option B is the most accurate and technically correct answer.

Concept Tested & Keywords

Concept Tested: Definition and principle of Reverse Transcriptase Polymerase Chain Reaction (RT-PCR).
Stem keywords: RTPCR, term, denotes
Lead-in keywords: NOT
Negative lead-in flag: false

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E6 Textbook of Biochemistry for medical StudentsDM Vasudevan Part 2 — Subpart B (pp 240-463 of 478) p. 59-61

E6 Microbiology Essentials Sastry 4e Part 1 p. 61-63

E6 Microbiology Applied AnjuDhir 3e Part 2 p. 104-106

Practise the full UPPSC-2021

Attempt every question from this paper in a timed mock, then review the full solution for each one.