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Challenging Questions about Heredity
25 minutes for 25 problems.
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Last updated: January 25, 2026
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| First submitted | January 25, 2026 |
| Times taken | 1 |
| Average score | 28.0% | Report this quiz | Report |
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1. What is the key feature that distinguishes Sanger sequencing from PCR?
Use of primers
Use of dNTPs
Thermal cycling
Incorporation of dideoxynucleotides
2. The lac operon is an example of:
Eukaryotic gene regulation
RNA processing
Inducible gene regulation
Constitutive expression
3. In Sanger sequencing, shorter DNA fragments migrate:
At the same rate
Faster
Backward
Slower
4. When lactose is present and glucose is absent, lac operon expression is:
Completely off
Repressed
Basal
Maximally induced
5. Increasing annealing temperature in PCR generally results in:
More nonspecific binding
Less primer binding
Denaturation of polymerase
Increased mutation rate
6. The lac repressor binds to which region?
Promoter
Operator
Structural Genes
CAP site
7. Why is Taq polymerase used in PCR
RNA synthesis
Heat stability
High fidelity
Ability to ligate DNA
8. Which experimental question is best addressed using Sanger sequencing?
How fast does DNA replicate?
What is the exact nucleotide sequence of a DNA fragment?
How many chromosomes are present?
Is a gene expressed?
9. What role does tRNA play during translation?
Synthesizes amino acids
Terminates translation
Carries amino acids to the ribosome
Forms peptide bonds
10. The central dogma describes the flow of genetic information from:
DNA → Protein → RNA
Protein → RNA → DNA
DNA → RNA → Protein
RNA → DNA → Protein
11. Which form of chromatin is transcriptionally active?
Heterochromatin
Euchromatin
Telomeric DNA
Centromeric DNA
12. Which PCR component determines specificity of amplification?
DNA polymerase
Buffer
Primers
Template DNA
13. PCR is most useful for
Protein sequencing
Amplifying specific DNA regions
Detecting Chromosomal rearrangements
visualizing whole genomes
14. The ribosome moves along mRNA in which direction?
Synthesizes amino acids
Terminates translation
Carries amino acids to the ribosome
Forms peptide bonds
15. What occurs at the replication fork?
DNA is packaged into histones
Chromosomes condense
DNA strands separate and replication proceeds
RNA is translated
16. A single nucleotide insertion that alters the reading frame is classified as:
Silent mutation
Nonsense mutation
Frameshift mutation
Missense mutation
17. Which component is essential for PCR but not required for DNA replication in vivo?
dNTPs
DNA polymerase
Thermostable polymerase
Primers
18. Plasmids are best described as:
Protein-DNA complexes
Linear eukaryotic chromosomes
RNA molecules
Circular DNA molecules in bacteria
19. During which PCR step do primers bind to template DNA?
Extension
Elongation
Denaturation
Annealing
20. Which result would indicate a successful PCR reaction?
Smear of DNA
Protein Precipitation
No DNA bands
A distinct band of expected size
21. Translation begins at which codon?
UAG
UAA
UGA
AUG
22. During transcription initiation, RNA polymerase binds to the:
Ribosome
Terminator
Start codon
Promoter
23. Transcription factors primarily function to:
Translate mRNA
Degrade RNA
Bind DNA and regulate transcription
Replicate DNA
24. Which mutation introduces a premature stop codon?
Frameshift
Missense
Nonsense
Silent
25. Which direction does RNA polymerase synthesize RNA?
Bidirectional
3′→5′
Random
5′→3′
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