Genes and chromosomes – chromatin, euchromatin, heterochromatin, giant chromosomes - Question Bank
1. Which type of chromatin is more sensitive to DNase I digestion, indicating a more open structure?
2. The study of giant chromosomes has been instrumental in understanding:
3. Which of the following is NOT a characteristic of heterochromatin?
4. The differential condensation of chromatin into euchromatin and heterochromatin is a key mechanism for:
5. Lampbrush chromosomes are characterized by extensive looping, which facilitates:
6. The 'puffs' in polytene chromosomes are regions where:
7. Polytene chromosomes are formed by endomitosis, which is a process where:
8. The transition from a decondensed euchromatic state to a condensed heterochromatic state is often mediated by:
9. Which component of chromatin is primarily responsible for the basic structure of the nucleosome?
10. The specific banding pattern of chromosomes, observable in both polytene and mitotic chromosomes, is often used for:
11. Heterochromatin plays a role in maintaining genome stability by:
12. Which histone modification is generally associated with active transcription in euchromatin?
13. The chromomeres, visible as bead-like structures in chromosomes, are more prominent in:
14. Polytene chromosomes are an example of which phenomenon?
15. The transformation of euchromatin to heterochromatin can lead to:
16. Which of the following is a consequence of the tightly packed nature of heterochromatin?
17. The telomeres, regions at the ends of eukaryotic chromosomes, are typically composed of:
18. In lampbrush chromosomes, the lateral loops are extensions of the axial fiber that are actively engaged in:
19. Giant chromosomes like polytene chromosomes allow for:
20. Heterochromatin is often characterized by:
21. The euchromatic regions of a chromosome are typically:
22. Which of the following terms describes the DNA-protein complex that makes up chromosomes?
23. The structural organization of chromatin, including euchromatin and heterochromatin, is crucial for:
24. The process of 'chromosome puffing' in polytene chromosomes indicates:
25. The Barr body, found in the nuclei of female mammals, is an example of:
26. Which of the following is a type of heterochromatin that is present in all cells of an organism and is replicated late?
27. The functional significance of the lampbrush structure is to:
28. In lampbrush chromosomes, the axial structure consists primarily of:
29. The banding patterns observed in Giemsa-stained polytene chromosomes are related to:
30. The formation of polytene chromosomes involves multiple rounds of:
31. Euchromatin is generally associated with:
32. Which of the following is a key feature of heterochromatin?
33. Histones are a class of proteins that are primarily involved in:
34. The term 'chromatin' refers to the complex of:
35. The loops extending from the central axis of lampbrush chromosomes are sites of:
36. Lampbrush chromosomes are typically found during which stage of meiosis?
37. Which type of giant chromosome exhibits a lampbrush appearance?
38. The characteristic 'puffs' or 'balbiani rings' observed in polytene chromosomes represent:
39. Polytene chromosomes are commonly found in:
40. Giant chromosomes, such as polytene chromosomes, are formed by:
41. Which of the following is a characteristic of heterochromatin compared to euchromatin?
42. The centromere region of a chromosome is typically rich in:
43. Facultative heterochromatin:
44. Constitutive heterochromatin is typically found:
45. Which of the following is a function of euchromatin?
46. Heterochromatin is characterized by:
47. Which type of chromatin is generally transcriptionally active and loosely packed?
48. The complex of DNA and proteins that forms chromosomes within the nucleus of eukaryotic cells is called:
49. Which of the following is NOT a component of a chromosome?
50. What is the fundamental unit of heredity?