Practice Test GeeksPCR - Polymerase Chain Reaction Certification Practice Test

PCR Cheat Sheet 2026

The 30 highest-yield PCR facts, distilled from real exam questions. Print it, save it as a PDF, or study it here โ€” free, no sign-up.

100 questions
150 min time limit
70.00% to pass
  1. Which standard curve slope falls OUTSIDE the commonly accepted 90-110% efficiency range? โ†’ -3.85
  2. A results statement reads: 'Gene X was significantly upregulated.' What should be added to make it rigorous? โ†’ The fold change, statistical test used, p-value, and sample size
  3. What is a common result of running too many cycles (e.g., 40-45) in endpoint PCR? โ†’ Smearing and buildup of nonspecific products after the plateau
  4. Which PCR additive is commonly used to relieve inhibition by binding inhibitors such as phenolics and humic acids? โ†’ Bovine serum albumin (BSA)
  5. What does high background noise on a gel suggest? โ†’ Primer dimers or contamination
  6. What is the minimum recommended distance (amplicon size) between the forward and reverse primers for reliable standard PCR amplification? โ†’ 100โ€“3000 bp
  7. Which collection tube is designed to stabilize intracellular RNA in whole blood at collection? โ†’ PAXgene Blood RNA tube
  8. In the ฮ”ฮ”Ct method, a target gene shows a ฮ”ฮ”Ct of -2. What is its fold change relative to the calibrator, assuming 100% efficiency? โ†’ 4-fold increase
  9. When using optical adhesive sealing films on 96-well PCR plates for real-time PCR, what critical quality issue must be avoided during application? โ†’ Air bubbles between the film and plate wells, which scatter fluorescent signal
  10. What is the role of data in quality assurance & control programs for Polymerase Chain Reaction? โ†’ Data provides objective evidence for decision-making and measuring progress
  11. How does UV irradiation of a PCR hood help prevent contamination? โ†’ It induces thymine dimers and crosslinks that make contaminating DNA non-amplifiable
  12. Why should lab coats used in the post-PCR area never be worn into the pre-PCR area? โ†’ They can carry amplicons that contaminate clean reagents and setups
  13. An extraction blank (reagent-only sample processed alongside specimens) is used to detect what? โ†’ Contamination introduced during the extraction process
  14. How many unique patient identifiers do accrediting bodies generally require on a specimen sent for PCR testing? โ†’ At least two
  15. What is the function of the buffer solution in PCR? โ†’ Stabilizes pH and ionic strength
  16. When should a PCR specimen container be labeled? โ†’ In the presence of the patient at the time of collection
  17. In acid phenol-chloroform extraction (pH ~4.5), where does RNA partition? โ†’ Aqueous phase
  18. Which element is ESSENTIAL for an effective regulatory standards & compliance program in Polymerase Chain Reaction? โ†’ Regular audits and continuous monitoring processes
  19. A conventional PCR gives no band for your samples, but the positive control amplifies strongly. What is the most likely cause? โ†’ The sample template has inhibitors or is degraded
  20. For air pressure control, the pre-PCR (reagent preparation) room should ideally be: โ†’ At positive pressure relative to adjacent areas
  21. How is RNA contamination prevented in DNA extraction? โ†’ Add RNAse enzyme
  22. Which sample type is generally most challenging for PCR due to co-extracted inhibitors? โ†’ Organic-rich soil and sediment
  23. A no-template control (NTC) shows amplification. What is the most likely interpretation? โ†’ Reagents or the workspace are contaminated with target DNA or amplicon
  24. An A260 reading of 1.0 corresponds to approximately what concentration of double-stranded DNA? โ†’ 50 ยตg/mL
  25. A temperature verification shows the denaturation step set at 95ยฐC actually reaches only 93.5ยฐC. What is the most likely effect on PCR? โ†’ Incomplete template denaturation and reduced amplification efficiency
  26. Which barrier MOST commonly hinders effective scientific writing & communication in Polymerase Chain Reaction? โ†’ Lack of active listening and assumptions about understanding
  27. What is a major advantage of magnetic bead-based extraction over manual spin columns in a high-throughput lab? โ†’ It is easily automated without centrifugation
  28. Under CLIA, how many proficiency testing events per year are generally required for a regulated analyte? โ†’ Three
  29. In Polymerase Chain Reaction, how does specimen collection & handling contribute to professional credibility? โ†’ By demonstrating competence, maintaining standards, and delivering consistent results
  30. What is the optimal melting temperature (Tm) range for most PCR primers? โ†’ 55โ€“65ยฐC
Turn these facts into recall:
๐Ÿƒ PCR Flashcards๐Ÿ“š PCR Study Guide

What Practice Test Geeks adds beyond an AI chat for PCR

An AI chatbot can quiz you, but it can't reproduce the exam conditions or keep your record. Here you get:

  • A timed, full-length PCR mock exam โ€” 100 questions in 150 minutes with a 70% pass mark, modeled on the official exam's question count and time limit, followed by a score report broken down by exam domain.
  • A fixed PCR question bank: the same test every attempt, so your score is comparable from one try to the next instead of changing with every regenerated quiz.
  • Progress saved on your device: completed tests, scores and missed questions stay in My Progress, so you can retake only what you got wrong.
  • PCR flashcards built from the same question bank.
  • Free PCR practice tests with the correct answer shown after each question.
Start the Timed PCR Mock Exam โ†’
Was this helpful?

How this page was made: written with AI tools and published by Nathan Beja, founder of Practice Test Geeks, who is responsible for its content. We have not yet matched this exam's facts to an official source, so confirm fees, dates and rules with the exam body. Not reviewed by a subject-matter expert. Editorial policy