Question

keratinocytes:
a are found in both the dermal and the epidermal layers of the skin
b are responsible for the reduction of water loss from the skin
c determine thickness of the skin
d produce skin pigments in cell organelles called melanosomes
e are special cells of the immune system

Explanation:

• Keratinocytes are mainly in the epidermis, not the dermis (so A is wrong).
• Melanocytes produce skin pigments in melanosomes (so D is wrong).
• Langerhans cells are part of the immune system (so E is wrong).
• Keratinocytes produce keratin which helps reduce water loss from the skin. Thickness of the skin is more related to factors like the number of cell layers in different body areas rather than just keratinocytes (so C is less accurate).

Answer:

B. are responsible for the reduction of water loss from the skin