Podcast
Questions and Answers
What is the primary function of a telomere?
What is the primary function of a telomere?
Which enzyme is responsible for synthesizing RNA primers during DNA replication?
Which enzyme is responsible for synthesizing RNA primers during DNA replication?
Which of the following is true about euchromatin?
Which of the following is true about euchromatin?
Which DNA sequence is recognized by restriction enzymes?
Which DNA sequence is recognized by restriction enzymes?
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What mechanism ensures dosage compensation in mammals?
What mechanism ensures dosage compensation in mammals?
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What is the basic unit of chromatin structure?
What is the basic unit of chromatin structure?
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Which type of genetic variation is associated with microsatellites?
Which type of genetic variation is associated with microsatellites?
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What is the genetic material of retroviruses?
What is the genetic material of retroviruses?
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Which method is used to detect large blocks of DNA repeats organized in tandem arrays?
Which method is used to detect large blocks of DNA repeats organized in tandem arrays?
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What percentage of the human genome is composed of protein-coding exons?
What percentage of the human genome is composed of protein-coding exons?
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What key knowledge is required for positional cloning?
What key knowledge is required for positional cloning?
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At which level does the regulation of gene expression occur in eukaryotic cells?
At which level does the regulation of gene expression occur in eukaryotic cells?
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Which agarose gel concentration is suitable for fractionating uncut genomic DNA?
Which agarose gel concentration is suitable for fractionating uncut genomic DNA?
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What substance mimics allolactose to remove the lac repressor protein in E. coli?
What substance mimics allolactose to remove the lac repressor protein in E. coli?
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What type of DNA sequences were identified by density gradient ultracentrifugation in eukaryote genomes?
What type of DNA sequences were identified by density gradient ultracentrifugation in eukaryote genomes?
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What defines heterochromatin in genomic structures?
What defines heterochromatin in genomic structures?
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How has the understanding of 'one gene one protein' changed?
How has the understanding of 'one gene one protein' changed?
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What is considered a main source of genetic variation?
What is considered a main source of genetic variation?
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Study Notes
Multiple Choice Questions
- Telomere function: Protects chromosome ends from degradation
- RNA primer synthesis enzyme: Primase
- Euchromatin characteristic: Site of active gene expression
- Restriction enzyme recognition sequence: Palindromic sequences
- Dosage compensation mechanism in mammals: X-inactivation
- Non-coding RNA example: tRNA
- Spindle fiber attachment structure: Centromere
- Promoter function: Binds RNA polymerase to initiate transcription
- Transposable element using RNA: Class I elements
- Chromatin unit: Nucleosome
- Microsatellite variation type: Tandem repeats
- Hardy-Weinberg equilibrium assumption: Large population size
- Retrovirus genetic material: Single-stranded RNA
- Start codon function: Specifies where to begin translation
- Frameshift mutation type: Insertion or deletion
Short Answer Questions (SAQ) - Part A
- Large DNA repeat analysis method: Restriction endonuclease digests and microsatellite DNA polymorphism
- Percentage of human genome contributing to protein-coding exons: Less than 2%
- Positional cloning prerequisite: Knowledge about the map location of a gene
- Eukaryote gene expression regulation: At every stage, from histone modification in chromatin, transcription factors, mRNA processing, mRNA transport, and storage to translation.
- Agarose gel electrophoresis for genomic DNA: 1.5% agarose concentration
- Molecular mimic of allolactose in DH5α E. coli: Isopropyl β- d-1-thiogalactopyranoside (IPTG)
- Major component identified in eukaryote genome analysis: Tandemly arrayed repetitive DNA sequences (satellite DNA)
- Heterochromatin: Repetitive regions of DNA
- "One gene, one protein" principle modification: Due to alternative splicing
- Sources of phenotypic and genotypic variation: All answers are correct (implied)
Short Answer Questions (SAQ) - Part B
- Is evolution finished? No. Evolution is a continuous process driven by natural selection, mutation, genetic drift, gene flow, and recombination.
- Examples of ongoing evolution:
- Bacteria and drug resistance: Emergence of antibiotic-resistant bacteria (e.g., MRSA).
- Human evolution: Lactose tolerance (mutation in the LCT gene in populations with dairy farming), skin pigmentation adaptation.
- Climate change and animal adaptation: Hybridization of Arctic animals (e.g., polar bears and grizzly bears) to changing environments.
- Artificial selection: Development of disease-resistant crop varieties.
- Conclusion: Evolution will continue due to genetic variation and changing environments.
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Description
Test your knowledge on key concepts of molecular biology, including telomere functions, RNA synthesis, and gene expression mechanisms. This quiz covers essential topics such as chromosome structure, genetic mutations, and the molecular functions of various nucleic acids.
