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

1. Overview of Cell Biology

Overview of Tissue Structures

Cell Biology

1. Overview of Cell Biology

Overview of Tissue Structures

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Multiple Choice

Which of the following statements about keratinocytes is NOT true?

Keratinocytes play a role in forming a protective barrier against pathogens.

Keratinocytes undergo differentiation as they move toward the skin surface.

Keratinocytes produce melanin, the pigment responsible for skin color.

Keratinocytes are the primary cell type found in the epidermis.

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Verified step by step guidance

Step 1: Understand the role of keratinocytes. Keratinocytes are the primary cell type in the epidermis, the outermost layer of the skin. They are responsible for forming a protective barrier against environmental damage, pathogens, and water loss.

Step 2: Review the process of keratinocyte differentiation. As keratinocytes move from the basal layer of the epidermis to the surface, they undergo a process of differentiation, eventually forming the stratum corneum, which is composed of dead, flattened cells that provide a tough, protective layer.

Step 3: Clarify the role of melanin production. Melanin, the pigment responsible for skin color, is produced by melanocytes, not keratinocytes. Melanocytes transfer melanin to keratinocytes, but keratinocytes themselves do not produce melanin.

Step 4: Evaluate the statements provided in the question. Identify which statements accurately describe keratinocytes and which do not. The statement 'Keratinocytes produce melanin, the pigment responsible for skin color' is incorrect because melanin production is the function of melanocytes.

Step 5: Conclude that the correct answer is the statement that is NOT true about keratinocytes, which is 'Keratinocytes produce melanin, the pigment responsible for skin color.'