BIOL235 Chapter 5 Practice Test Questions and Correct Answers

BIOL235 Chapter 5 Practice Test Questions and Correct Answers Which of the following is not true of epidermal ridges? A: form during the last trimester of development B: increase tactile sensitivity by increasing the density of Meissner corpuscles C: combine with sweat to form fingerprints D: create a strong bond between the epidermis and dermis in areas of high stress - ANSWER A: form during the last trimester of development Q 5.51: Which of the following is true about skin color? A: Skin color of light-skinned people is strongly influenced by the oxygen content of hemoglobin. B: Skin color of light-skinned people is due mainly to carotene. C: The enzyme melanase is used by melanosomes to synthesize melanin. D: Melanin production increases in response to mechanical stress on the skin - ANSWER A: Skin color of light-skinned people is strongly influenced by the oxygen content of hemoglobin. Q 5.52: Which of the following is not true about melanin? A: Melanin production increases in response to DNA damage. B: Exposure to UV radiation increases enzymatic activity in melanosomes. C: Melanin neutralizes free radicals. D: Melanin reflects UV radiation back out of the epidermis. - ANSWER D: Melanin reflects UV radiation back out of the epidermis. Q 5.53: About 75% of epidermal cells are keratinocytes. True or False? - ANSWER False (90% are keratinocytes) Q 5.54: Which layer of the epidermis contains flattened clear, dead keratinocytes? A: stratum spinosum B: stratum granulosum C: stratum basale D: stratum lucidum E: stratum corneum - ANSWER D: stratum lucidum Q 5.55: Melanocytes are found in mucous membranes. True or False? - ANSWER True Q 5.56: Mary has severe anemia; she will likely exhibit ___________. - ANSWER Pallor Q 5.57: Keratin intermediate filaments are also known as________ - ANSWER tonofilaments. Q 5.58: Desmosomes bind keratinocytes to ______. A: other keratinocytes B: melanocytes C: the basement membrane D: the hypodermis E: stem cells - ANSWER A: other keratinocytes