PART 1: Is There a Connection Between UV Radiation and Skin Color?

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PART 1: Is There a Connection Between UV Radiation and Skin Color?

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What protein in our cells is responsible for absorbing and reflecting different wavelengths of light? *

1 point

hemoglobin

melanin

keratin

catalase

What are your first and last names? *

Using the map below, what is the relationship between the UV index (color scale) and the latitude (y-axis)? (mark all that apply) *

1 point

Captionless Image

As latitude increases from zero, the UV index increases.

As latitude increases from zero, the UV index decreases.

As latitude decreases from zero, the UV index increases.

As latitude decreases from zero, the UV index decreases.

Required

What type of radiation does melanin absorb to protect our DNA from mutations? *

1 point

infrared

visible light

ultraviolet

gamma rays

Where you might expect to find native lightly vs. darkly pigmented people (i.e. producing different amounts and kinds of melanin) on the planet? Why? *

1 point

Light pigmentation at the poles and dark pigmentation at the equator because the UV index is highest at the equator and lowest at the poles.

Dark pigmentation at the poles and light pigmentation at the equator because the UV index is highest towards the poles and lowest at the equator.

Light pigmentation at the poles and dark pigmentation at the equator because the UV index is lowest at the equator and highest near the poles.

Dark pigmentation at the poles and light pigmentation at the equator because the UV index is lowest towards the poles and highest at the equator.

In the spectrum that represents all of humanity's skin color, people with fair skin (who often also have red hair) produce _____, while people with darker shades of skin produce _____. *

1 point

pheomelanin; eumelanin

eumelanin; pheomelanin

pheomelanin; neuromelanin

neuromelanin; eumelanin

Which statement best summarizes the advantages skin color provides to humans according to this part of the case study? *

1 point

It is most advantageous for everyone to have dark skin because we are all exposed to a high level of UV radiation.

It is most advantageous for everyone to light skin because we are all exposed to a low level of UV radiation.

It is most advantageous for everyone to have dark skin because we are all exposed to a low level of UV radiation.

It is most advantageous for people to have one of various skin colors, whichever is appropriate to their UV exposure.

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