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HHMI BioInteractive – How We Get Our Skin Color: Verified Study Guide on Skin Layers, UV Effects, and Melanin Function

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This study guide provides verified answers for all key concepts from the HHMI BioInteractive lesson “How We Get Our Skin Color.” It covers the structure and function of the skin's layers (epidermis, dermis, hypodermis), the life cycle of keratinocytes, the role of melanin (eumelanin and pheomelanin), UV radiation's biological impact, DNA protection mechanisms, and vitamin D synthesis. Perfect for high school or introductory college biology students learning about human adaptation and the science behind skin pigmentation.

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HHMI Bio Interactive How We Get Our Skin Color
Study Guide
Constitutive skin color Ans✓✓✓skin color determined by our genes


dermis Ans✓✓✓middle layer: contains blood vessels, hair follicles,
sweat and oil glands, supplies epidermis with oxygen and nutrients,
regulates body temperature


Describe the Life cycle of a keratinocyte. Ans✓✓✓keratinocytes form
at the bottom of the epidermis and then migrate to the top. youngest at
the bottom and oldest at the top


DNA and folate Ans✓✓✓2 molecules in the body that UV radiation
can damage


epidermis Ans✓✓✓outermost layer: protects the body from the
elements, serves as a barrier to keep bacteria and viruses out and keep
water in, keratinocytes and melanocytes located here, it produces
Vitamin D


eumelanin Ans✓✓✓brownish black pigment, higher percentage results
in brown or black skin


Facultative skin color Ans✓✓✓altered color resulting from UV
exposure and tanning

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