Which of the following statements about melanin is most accurate?

Table of Contents Show

What is melanin quizlet?
Which of the following statements is true concerning how light interacts with the pigments in a red tomato quizlet?
Which of the following statements is true about human skin color quizlet?
How is melanin produced quizlet?

1.	Which of the following statements is true about human skin color?


		a)	It ranges from pure white to pure black.
		b)	It is primarily due to the presence of a pigment called melanin which is found in all normal humans.
		c)	It may be due in part to the presence of blood flowing near the skin.
		d)	B and C


2.	Which of the following is true of the melanin in human skin?


	a)	It is obtained from the foods that we eat.
	b)	It is produced by our livers.
	c)	It is produced in our skin.
	d)	Only Africans and other dark complexioned people have it.


3.	Which of the following statements is true about melanin?


	a)	Its primary function is to increase the penetration of ultraviolet radiation through the skin.
	b)	Skin may vary seasonally in the amount it contains.
	c)	People with high concentrations of it in their skin are at a greater risk for skin cancer.


4.	Gloger's Rule implies that:


	a)	there should be a random distribution around the world of people who have low concentrations of skin pigmentation
	b)	dark skin has an advantage for people who live in far northern latitudes
	c)	over many generations, natural selection is largely responsible for changes in human skin color


5.	How can we best account for the fact that, contrary to Gloger's Rule, millions of dark complexioned people live in temperate and even arctic latitudes today?


	a)	When a population of light skin people moves into far northern regions, natural selection makes their skin dark in only a few generations.
	b)	Gloger's Rule is wrong.
	c)	Human societies have been very active in migrating around the planet in recent centuries.


6.	Prior to Columbus, the darker complexioned human populations lived:
		Map Help

	a)	mostly in the middle latitudes, between 20 degrees north and south of the equator
	b)	only south of the equator
	c)	only in Africa
	d)	A and C


7.	What is the connection between ultraviolet radiation and the production of vitamin D in humans?


	a)	Ultraviolet radiation stimulates the production of vitamin D in our bodies.
	b)	Ultraviolet radiation stops our bodies from producing vitamin D.
	c)	There is no connection between ultraviolet radiation and the production of vitamin D in our bodies.

What is melanin quizlet?

Melanin. a pigment that ranges in color from yellow to brown to black. Sunlight stimulation. causes the cells to produce more melanin = suntan. Melanocytes.

Which of the following statements is true concerning how light interacts with the pigments in a red tomato quizlet?

Which of the following statements are true concerning how light interacts with the pigments in a red tomato? The pigments likely protect the cells in the tomato from DNA damage.

Which of the following statements is true about human skin color quizlet?

1. Which of the following statements is true about human skin color? It ranges from pure white to pure black. It is primarily due to the presence of a pigment called melanin which is found in all normal humans.

How is melanin produced quizlet?

-Process: Melanin is synthesized from aa TYR in melasomes by protein enzymes, then is moved from melanosomes out of the melanocyte to skin cell called, karatinocyte. -Light and dark skin have same number of melanocytes, different numbers of melanosomes.