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An enhancer is a DNA sequence that increases transcription levels when bound by transcription factors.
Ref: NCERT Class 12 Biology Chapter 5: Molecular Basis of Inheritance Regulation of Gene Expression - Lac Operon
A promoter is a DNA sequence where RNA polymerase binds to initiate transcription.
Ref: NCERT Class 12 Biology Chapter 5: Molecular Basis of Inheritance Transcription - Mechanism and RNA Polymerase
The TATA box is a promoter sequence that binds transcription factors and RNA polymerase to initiate transcription.
Ref: NCERT Class 12 Biology Chapter 5: Molecular Basis of Inheritance Transcription - Mechanism and RNA Polymerase
Repetitive DNA localization reflects functional specialization of chromosome domains. Minisatellites, classified as VNTRs with 10-100 bp units, frequently cluster in subtelomeric and terminal regions, contributing to telomere stability, recombination hotspots and chromosome pairing during meiosis. Macrosatellites also reside at centromeres and heterochromatic blocks. SSRs and STRs, representing microsatellites with 1-6 bp motifs, are interspersed throughout euchromatin rather than enriched at ends. Preferential accumulation of minisatellite arrays near telomeres supports their structural role
Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.
Z-DNA is the scientifically accurate answer to this question. Within the study of DNA, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of Z-DNA directly address what is being asked. Among the other options, B-DNA, A-DNA, and H-DNA do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.
Ref: Molecular Biology of the Gene, Watson et al., 7th Ed.
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