Biomed 100 Practice Quiz
Chapter 6, Spring 2008
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Multiple Choice - One Correct Choice Per Question
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  1. Living keratinocyte stem cells and melanocytes are normally present in the
    1. dermis
    2. epidermis
      3.
    3. both of the above
    4. none of the above

  2. Cells of the stratum corneum contain mainly
    1. DNA
    2. keratin
      3.
    3. melanin
    4. carotene
    5. hemoglobin

  3. The primary function of _?_ is to "block" ultraviolet rays.
    1. keratin
    2. melanin
      3.
    3. hemoglobin
    4. stem cells

  4. The "sunshine vitamin," produced when skin is exposed to sunlight, is
    1. melanin
    2. thymine
    3. carotene
    4. vitamin C
    5. vitamin D
      6.

  5. Which one of the following statements is true?
    1. The "thick skin" of palms and soles contains one or more additional layers in dermis.
    2. The "thick skin" of palms and soles contains one or more additional layers in epidermis.
      3.
    3. In a person who has dark skin, the epidermis contains more melanocytes than keratinocytes.
    4. Within a specific area, such as the forehead, dark skin contains more melanocytes per square centimeter than does light skin.

  6. Structures that are often attached to each other are
    1. hair follicles and sebaceous glands (skin oil glands)
    2. hair follicles and sudoriferous glands (sweat glands)
    3. sebaceous glands and sudoriferous glands
    4. hair follicles, sebaceous glands, and sudoriferous glands
    5. none of the above are ever attached to each other

  7. The living cells of epidermis receive most of their oxygen and nutrients from
    1. the atmosphere
    2. blood vessels in the dermis
      3.
    3. blood vessels in the epidermis
    4. both B and C
    5. none of the above (there are no living cells in the epidermis)

  8. Dilation of blood vessels in the skin is likely to
    1. occur when body temperature is too low
    2. allow increased release of heat from the body
      3.
    3. prevent release of heat from the body

  9. It is not true that following mitotic division of one keratinocyte stem cell,
    1. one cell remains a stem cell.
    2. one cell becomes a melanocyte.
      3.
    3. one cell begins slowly moving through the layers of epidermis.