Genes and chromosomes – chromatin, euchromatin, heterochromatin, giant chromosomes - One Line Questions

1. Heterochromatin is often characterized by: — Enriched repetitive DNA sequences
2. Lampbrush chromosomes are typically found during which stage of meiosis? — Prophase I (specifically diplotene stage)
3. What is the fundamental unit of heredity? — Gene
4. The differential condensation of chromatin into euchromatin and heterochromatin is a key mechanism for: — Cellular differentiation and development
5. Polytene chromosomes are an example of which phenomenon? — Endopolyploidy
6. The process of 'chromosome puffing' in polytene chromosomes indicates: — Active gene expression
7. The chromomeres, visible as bead-like structures in chromosomes, are more prominent in: — Lampbrush chromosomes
8. The specific banding pattern of chromosomes, observable in both polytene and mitotic chromosomes, is often used for: — Identifying chromosomal abnormalities
9. Which of the following is NOT a component of a chromosome? — RNA
10. The term 'chromatin' refers to the complex of: — DNA and proteins
11. The 'puffs' in polytene chromosomes are regions where: — Transcription is occurring
12. Lampbrush chromosomes are characterized by extensive looping, which facilitates: — Transcription of specific genes
13. The loops extending from the central axis of lampbrush chromosomes are sites of: — RNA synthesis (transcription)
14. Histones are a class of proteins that are primarily involved in: — Packaging and condensing DNA
15. In lampbrush chromosomes, the lateral loops are extensions of the axial fiber that are actively engaged in: — mRNA synthesis
16. The centromere region of a chromosome is typically rich in: — Heterochromatin
17. The Barr body, found in the nuclei of female mammals, is an example of: — Facultative heterochromatin
18. The telomeres, regions at the ends of eukaryotic chromosomes, are typically composed of: — Heterochromatin
19. Which of the following is a type of heterochromatin that is present in all cells of an organism and is replicated late? — Constitutive heterochromatin
20. Giant chromosomes, such as polytene chromosomes, are formed by: — Repeated rounds of DNA replication without cell division
21. The transformation of euchromatin to heterochromatin can lead to: — Transcriptional silencing
22. Which type of chromatin is generally transcriptionally active and loosely packed? — Euchromatin
23. Which type of chromatin is more sensitive to DNase I digestion, indicating a more open structure? — Euchromatin
24. Which of the following is a key feature of heterochromatin? — Late replication timing
25. The transition from a decondensed euchromatic state to a condensed heterochromatic state is often mediated by: — Histone deacetylases
26. Which component of chromatin is primarily responsible for the basic structure of the nucleosome? — Core histones (H2A, H2B, H3, H4)
27. Which histone modification is generally associated with active transcription in euchromatin? — Histone acetylation
28. Which of the following is a consequence of the tightly packed nature of heterochromatin? — Reduced accessibility to DNA repair enzymes
29. Euchromatin is generally associated with: — Open chromatin structure
30. Which of the following is NOT a characteristic of heterochromatin? — Early replication
31. Heterochromatin is characterized by: — Dense DNA packing and low gene activity
32. Polytene chromosomes are commonly found in: — Salivary glands of Drosophila larvae
33. The functional significance of the lampbrush structure is to: — Increase the surface area for gene transcription
34. The study of giant chromosomes has been instrumental in understanding: — The relationship between chromosome structure and gene activity
35. The formation of polytene chromosomes involves multiple rounds of: — Endoreduplication (DNA replication without cytokinesis)
36. Which of the following is a characteristic of heterochromatin compared to euchromatin? — Undergoes replication later in S phase
37. The complex of DNA and proteins that forms chromosomes within the nucleus of eukaryotic cells is called: — Chromatin
38. Which of the following terms describes the DNA-protein complex that makes up chromosomes? — Chromatin
39. Constitutive heterochromatin is typically found: — In regions that are always condensed
40. Which type of giant chromosome exhibits a lampbrush appearance? — Lampbrush chromosomes
41. Which of the following is a function of euchromatin? — Facilitating gene expression
42. Heterochromatin plays a role in maintaining genome stability by: — Preventing the formation of aberrant DNA structures
43. The structural organization of chromatin, including euchromatin and heterochromatin, is crucial for: — Regulation of gene expression
44. Giant chromosomes like polytene chromosomes allow for: — Detailed observation of gene activity
45. The characteristic 'puffs' or 'balbiani rings' observed in polytene chromosomes represent: — Sites of active gene transcription
46. Facultative heterochromatin: — Can change its condensation state depending on cellular needs
47. The euchromatic regions of a chromosome are typically: — Deacetylated histones and accessible to transcription machinery
48. In lampbrush chromosomes, the axial structure consists primarily of: — Double-stranded DNA with associated proteins
49. Polytene chromosomes are formed by endomitosis, which is a process where: — DNA replicates but the cell does not divide
50. The banding patterns observed in Giemsa-stained polytene chromosomes are related to: — The distribution of euchromatin and heterochromatin
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