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

Packaging of DNA

Cell Biology

4. DNA, Chromosomes, and Genomes

Packaging of DNA

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Multiple Choice

Which of the following histone proteins do not form dimers that make up the nucleosome core?

H2A

H2B

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Verified step by step guidance

Understand the structure of the nucleosome: The nucleosome is the fundamental unit of chromatin, consisting of DNA wrapped around a core of histone proteins.

Identify the histone proteins involved in the nucleosome core: The core is made up of histone proteins H2A, H2B, H3, and H4, which form dimers and then assemble into an octamer.

Recognize the role of histone H1: Histone H1 is not part of the nucleosome core. Instead, it is known as the linker histone, which binds to the DNA between nucleosomes, helping to compact the chromatin structure.

Differentiate between core histones and linker histones: Core histones (H2A, H2B, H3, H4) form the nucleosome core, while H1 stabilizes the structure by binding to the linker DNA.

Conclude which histone does not form dimers in the nucleosome core: Since H1 is a linker histone and not part of the core, it does not form dimers that make up the nucleosome core.