Stem Cells and Organelles in Skin Epidermis

Steps:

• Identify stem cells in the skin epidermis: basal keratinocytes act as stem cells, dividing to replenish the epidermis.
• Recognize that keratinocytes, including basal ones, differentiate into mature skin cells producing keratin.
• Determine the organelle needed for keratin production and secretion: Golgi bodies modify and package proteins like keratin.
• Match the choice that correctly includes both cell types and the appropriate organelle.

Why B is correct:

• Basal cells (stem-like keratinocytes) and keratinocytes require Golgi bodies for processing and secreting keratin, per cellular biology definitions of organelle function in protein modification.

Why the others are wrong:

• A: Centrioles aid cell division, not keratin secretion; excludes keratinocytes.
• C: Excludes keratinocytes; Golgi body misspells the plural form but mainly wrong on cells.
• D: Includes cells correctly but misspells organelle as singular "golgi body" instead of "golgi bodies."

Final answer: B