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AMT Molecular Diagnostics Technologist (MDT) Certification Exam, Exams of Medicine

Chamberlain College of NursingMedicine

AMT Molecular Diagnostics Technologist (MDT) Certification Exam

Typology: Exams

2025/2026

Available from 05/04/2026

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john-muriithi-2 🇺🇸

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AMT MOLECULAR DIAGNOSTICS
TECHNOLOGIST (MDT) CERTIFICATION EXAM
1. Which technique is primarily used to amplify DNA
sequences?
A. Southern blotting
B. Western blotting
C. Polymerase chain reaction
D. Northern blotting
Answer: C. Polymerase chain reaction
Rationale: Polymerase chain reaction (PCR) is a technique
specifically designed to amplify small amounts of DNA into
millions of copies, making it essential for molecular
diagnostics.
2. What enzyme is responsible for synthesizing DNA during
PCR?
A. RNA polymerase
B. DNA ligase
C. Restriction enzyme
D. Taq polymerase
Answer: D. Taq polymerase
Rationale: Taq polymerase is a heat-stable DNA
polymerase that can withstand the high temperatures used
in PCR denaturation steps.
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AMT MOLECULAR DIAGNOSTICS

TECHNOLOGIST (MDT) CERTIFICATION EXAM

  1. Which technique is primarily used to amplify DNA sequences? A. Southern blotting B. Western blotting C. Polymerase chain reaction D. Northern blotting Answer: C. Polymerase chain reaction Rationale: Polymerase chain reaction (PCR) is a technique specifically designed to amplify small amounts of DNA into millions of copies, making it essential for molecular diagnostics.
  2. What enzyme is responsible for synthesizing DNA during PCR? A. RNA polymerase B. DNA ligase C. Restriction enzyme D. Taq polymerase Answer: D. Taq polymerase Rationale: Taq polymerase is a heat-stable DNA polymerase that can withstand the high temperatures used in PCR denaturation steps.
  1. Which step of PCR involves separation of DNA strands? A. Annealing B. Extension C. Denaturation D. Ligation Answer: C. Denaturation Rationale: During denaturation, the double-stranded DNA is heated to separate it into single strands, allowing primers to bind.
  2. Which nucleic acid is single-stranded? A. DNA B. RNA C. Chromatin D. Histone Answer: B. RNA Rationale: RNA is typically single-stranded, whereas DNA exists as a double helix.
  3. What is the purpose of primers in PCR? A. To cut DNA B. To bind specific DNA sequences C. To replicate RNA D. To degrade proteins Answer: B. To bind specific DNA sequences Rationale: Primers are short sequences that anneal to

Rationale: DNA stores genetic information in its nucleotide sequence.

  1. What is the function of restriction enzymes? A. Join DNA fragments B. Cut DNA at specific sequences C. Replicate DNA D. Translate RNA Answer: B. Cut DNA at specific sequences Rationale: Restriction enzymes recognize specific DNA sequences and cleave them.
  2. Which component is NOT required for PCR? A. DNA template B. Primers C. DNA polymerase D. Ribosomes Answer: D. Ribosomes Rationale: Ribosomes are involved in protein synthesis, not DNA amplification.
  3. What is the role of magnesium ions in PCR? A. Denature DNA B. Stabilize primers C. Act as cofactor for polymerase D. Break DNA strands Answer: C. Act as cofactor for polymerase

Rationale: Magnesium ions are essential cofactors for DNA polymerase activity.

  1. What is a mutation? A. Normal DNA replication B. Change in DNA sequence C. Protein synthesis D. RNA transcription Answer: B. Change in DNA sequence Rationale: Mutations are alterations in the nucleotide sequence of DNA.
  2. Which type of mutation involves a single base change? A. Frameshift B. Missense C. Deletion D. Insertion Answer: B. Missense Rationale: A missense mutation results from a single nucleotide substitution that changes an amino acid.
  3. What is the complementary base of adenine in DNA? A. Cytosine B. Guanine C. Thymine D. Uracil

D. Microscope Answer: B. Spectrophotometer Rationale: Spectrophotometers measure DNA concentration by absorbance at 260 nm.

  1. What is cDNA? A. Circular DNA B. Complementary DNA C. Chromosomal DNA D. Coding DNA Answer: B. Complementary DNA Rationale: cDNA is synthesized from RNA using reverse transcriptase.
  2. Which process converts DNA to RNA? A. Translation B. Replication C. Transcription D. Mutation Answer: C. Transcription Rationale: Transcription is the process of synthesizing RNA from a DNA template.
  3. Which process converts RNA to protein? A. Transcription B. Translation C. Replication

D. Hybridization Answer: B. Translation Rationale: Translation uses mRNA to synthesize proteins at ribosomes.

  1. What is the role of ligase? A. Cut DNA B. Join DNA fragments C. Amplify DNA D. Degrade RNA Answer: B. Join DNA fragments Rationale: DNA ligase forms phosphodiester bonds between DNA fragments.
  2. Which mutation shifts the reading frame? A. Silent B. Missense C. Frameshift D. Nonsense Answer: C. Frameshift Rationale: Insertions or deletions can shift the reading frame of codons.
  3. What is a probe in molecular diagnostics? A. Enzyme B. Short DNA sequence C. Protein

D. Arthritis Answer: C. COVID- 19 Rationale: PCR is widely used to detect viral RNA such as SARS-CoV-2.

  1. What is sequencing? A. DNA cutting B. DNA amplification C. Determining DNA order D. Protein synthesis Answer: C. Determining DNA order Rationale: Sequencing identifies the exact order of nucleotides.
  2. Which base pairs with cytosine? A. Adenine B. Thymine C. Guanine D. Uracil Answer: C. Guanine Rationale: Cytosine pairs with guanine in DNA.
  3. What is the role of a thermocycler? A. Measure DNA B. Separate DNA C. Control PCR temperatures D. Visualize DNA

Answer: C. Control PCR temperatures Rationale: Thermocyclers automate temperature changes required for PCR.

  1. What is contamination in PCR? A. DNA degradation B. Unwanted DNA presence C. Temperature change D. Primer binding Answer: B. Unwanted DNA presence Rationale: Contamination can lead to false-positive results.
  2. What is the function of reverse transcriptase? A. DNA to RNA B. RNA to DNA C. Protein synthesis D. DNA repair Answer: B. RNA to DNA Rationale: Reverse transcriptase converts RNA into DNA.
  3. Which blot detects proteins? A. Southern B. Northern C. Western D. Eastern Answer: C. Western Rationale: Western blotting is used for protein detection.
  1. What is genomic DNA? A. RNA B. Entire DNA content C. Protein D. Lipid Answer: B. Entire DNA content Rationale: Genomic DNA includes all DNA within an organism.
  2. What is allele? A. Protein B. DNA enzyme C. Variant of a gene D. RNA strand Answer: C. Variant of a gene Rationale: Alleles are alternative forms of a gene.
  3. What is hybridization temperature dependent on? A. DNA size B. Primer sequence C. GC content D. All of the above Answer: D. All of the above Rationale: Hybridization temperature depends on length, GC content, and sequence.
  1. What is gel made of in DNA electrophoresis? A. Agarose B. Collagen C. Lipid D. Protein Answer: A. Agarose Rationale: Agarose gel forms a matrix for DNA separation.
  2. What is the purpose of loading dye? A. Amplify DNA B. Add color and weight C. Cut DNA D. Bind DNA Answer: B. Add color and weight Rationale: Loading dye helps visualize samples and ensures they sink into wells.
  3. Which step in PCR is repeated multiple times? A. Denaturation B. Annealing C. Extension D. All of the above Answer: D. All of the above Rationale: PCR consists of repeated cycles of all three steps.

B. Protein C. Circular DNA D. Lipid Answer: C. Circular DNA Rationale: Plasmids are small circular DNA molecules in bacteria.

  1. What is transformation? A. DNA amplification B. DNA uptake by cells C. Protein synthesis D. RNA transcription Answer: B. DNA uptake by cells Rationale: Transformation introduces DNA into host cells.
  2. What is sensitivity in diagnostics? A. False positives B. True positive detection rate C. False negatives D. Specificity Answer: B. True positive detection rate Rationale: Sensitivity measures ability to correctly identify positives.
  3. What is specificity? A. Detect all positives B. Detect true negatives

C. Amplify DNA D. Sequence DNA Answer: B. Detect true negatives Rationale: Specificity measures correct identification of negatives.

  1. What is contamination control method? A. Open tubes B. Separate work areas C. Reuse tips D. Skip controls Answer: B. Separate work areas Rationale: Separation prevents cross-contamination.
  2. What is real-time PCR used for? A. DNA cutting B. Quantification of DNA C. Protein detection D. RNA degradation Answer: B. Quantification of DNA Rationale: Real-time PCR monitors amplification in real time to quantify nucleic acids.
  3. Which fluorescent dye is commonly used in real-time PCR? A. Ethidium bromide B. SYBR Green
  1. Which method detects point mutations most precisely? A. Gel electrophoresis B. DNA sequencing C. Spectrophotometry D. Centrifugation Answer: B. DNA sequencing Rationale: DNA sequencing provides exact nucleotide order, allowing precise detection of point mutations.
  2. What is allele-specific PCR used for? A. DNA quantification B. Detect specific mutations C. Protein synthesis D. RNA degradation Answer: B. Detect specific mutations Rationale: Allele-specific PCR identifies known mutations by using primers that match specific alleles.
  3. What is a housekeeping gene? A. Viral gene B. Gene expressed constantly C. Mutated gene D. Noncoding DNA Answer: B. Gene expressed constantly

Rationale: Housekeeping genes maintain basic cellular function and are used as controls in experiments.

  1. Which molecule is measured in RT-PCR? A. DNA B. RNA C. Protein D. Lipid Answer: B. RNA Rationale: RT-PCR measures RNA levels by converting RNA into cDNA before amplification.
  2. What is the purpose of internal controls in PCR? A. Increase contamination B. Validate test accuracy C. Degrade DNA D. Speed up reaction Answer: B. Validate test accuracy Rationale: Internal controls ensure that the PCR reaction worked correctly and results are reliable.
  3. What is the principle of Sanger sequencing? A. Enzyme digestion B. Chain termination C. Hybridization D. Amplification Answer: B. Chain termination