PCR Study Guide 2026
Everything you need to pass the PCR exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 PCR Exam Format at a Glance
📚 PCR Topics to Study (68)
✍️ Sample PCR Questions & Answers
1. Which tissue fixative is least suitable for subsequent PCR analysis?
Bouin's contains picric acid, which severely degrades nucleic acids.
2. In a SYBR Green assay, the no-template control (NTC) amplifies at Ct 37 and its melt peak is well below the target Tm. What is the best interpretation?
Late NTC amplification with a low-Tm melt peak is typical of primer dimers, not contaminating target.
3. A DNA extract has A260/A280 of 1.85 but A260/A230 of 0.9. What is the most likely contaminant?
A low A260/A230 ratio indicates contaminants absorbing at 230 nm, such as guanidine salts, phenol, or carbohydrates.
4. Which method best verifies temperature uniformity across a thermal cycler block?
Multi-probe systems measure several well positions at the same time, which shows differences across the block.
5. What is a common specimen-handling cause of false-positive PCR results?
Tiny amounts of contaminating nucleic acid can be amplified, producing false positives.
6. Why is cycle number important in PCR?
The number of PCR cycles directly influences both the quantity and quality of the amplified DNA. Too few cycles result in insufficient product yield, while too many cycles can lead to a plateau effect, accumulation of errors, and the formation of non-specific products due to reagent depletion or increased chance of mispriming. Therefore, optimizing cycle number is crucial for achieving adequate DNA yield while maintaining the fidelity of the amplified product.
🎯 Free PCR Practice Tests
📖 PCR Guides & Articles
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 — 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.
- A printable PCR cheat sheet you can print or save as a PDF.
- PCR flashcards built from the same question bank.
- Free PCR practice tests with the correct answer shown after each question.
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