Table of contents

1. Overview of Cell Biology2h 49m
2. Chemical Components of Cells1h 14m
3. Energy1h 33m
4. DNA, Chromosomes, and Genomes2h 31m
5. DNA to RNA to Protein2h 31m
6. Proteins1h 36m
7. Gene Expression1h 42m
8. Membrane Structure1h 4m
- The Lipid Bilayer
  38m
- Membrane Proteins
  25m
9. Transport Across Membranes1h 52m
10. Anerobic Respiration1h 5m
11. Aerobic Respiration1h 11m
12. Photosynthesis52m
13. Intracellular Protein Transport2h 18m
14. Cell Signaling1h 28m
15. Cytoskeleton and Cell Movement1h 39m
16. Cell Division3h 5m
17. Meiosis and Sexual Reproduction50m
18. Cell Junctions and Tissues48m
19. Stem Cells13m
- Stem Cells
  13m
20. Cancer44m
21. The Immune System1h 6m
22. Techniques in Cell Biology1h 41m

4. DNA, Chromosomes, and Genomes

The Epigenetic Code

Cell Biology

4. DNA, Chromosomes, and Genomes

The Epigenetic Code

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Multiple Choice

The position of nucleosomes on a region of DNA can never change.

True

False

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Verified step by step guidance

Understand the role of nucleosomes: Nucleosomes are the basic unit of DNA packaging in eukaryotic cells, consisting of a segment of DNA wound around a core of histone proteins.

Recognize the dynamic nature of chromatin: Chromatin, which includes nucleosomes, is not static. It can undergo structural changes to allow access to DNA for processes such as transcription, replication, and repair.

Learn about nucleosome remodeling: Nucleosome positions can be altered by chromatin remodeling complexes, which use energy from ATP hydrolysis to reposition, eject, or restructure nucleosomes.

Consider the biological significance: The ability to change nucleosome positions is crucial for regulating gene expression, as it can expose or hide DNA sequences from transcription factors and other DNA-binding proteins.

Conclude with the correct understanding: Given the dynamic nature of chromatin and the role of remodeling complexes, the statement that nucleosome positions can never change is false.