Question 1

Which sublayer of the epidermis is primarily responsible for mitotic cell division and regeneration of keratinocytes?

Accepted Answer

Stratum basale

Question 2

A patient presents with a skin lesion that is asymmetrical, has irregular borders, multiple colors, and a diameter greater than 6 mm. Which type of skin cancer is most likely based on these ABCDE criteria?

Accepted Answer

Melanoma

Question 3

Which layer of the epidermis is only found in thick skin, such as the palms and soles?

Accepted Answer

Stratum lucidum

Question 4

Keratinocytes begin to die and lose their nuclei in which sublayer of the epidermis?

Accepted Answer

Stratum granulosum

Question 5

Which of the following is a key function of the stratum corneum?

Accepted Answer

Providing a waterproof barrier

Question 6

A biopsy reveals abnormal proliferation of keratinocytes in the stratum spinosum. Which type of skin cancer is most likely?

Accepted Answer

Squamous cell carcinoma

Question 7

Which cell type found in the stratum basale is responsible for producing pigment that protects against UV radiation?

Accepted Answer

Melanocytes

Question 8

If a patient has a genetic defect that impairs keratin production, which layer of the epidermis would be most affected?

Accepted Answer

Stratum corneum

Question 9

Which of the following best describes the arrangement of cells in the stratum spinosum?

Accepted Answer

Several layers of polygonal cells connected by desmosomes

Question 10

A patient presents with a pearly, translucent nodule on the face. Which type of skin cancer is most likely?

Accepted Answer

Basal cell carcinoma

Question 11

Which sublayer of the epidermis contains cells that release lipids to help form a waterproof barrier?

Accepted Answer

Stratum granulosum

Question 12

Which equation best represents the relationship between the rate of cell division ($$R) in $$the stratum basale and the thickness ($$T) of $$the epidermis, assuming a direct proportionality?

Accepted Answer

$$R = kT$$

Question 13

Which of the following is NOT a characteristic used in the ABCDE rule for identifying melanoma?

Accepted Answer

Elevation above the skin surface

Question 14

A patient with a history of chronic sun exposure develops a scaly, red patch on the forearm. Which skin cancer is most likely?

Accepted Answer

Squamous cell carcinoma

Question 15

Which sublayer of the epidermis is most important for tactile sensation due to the presence of Merkel cells?

Accepted Answer

Stratum basale

Question 16

If the rate of keratinocyte migration from the stratum basale to the stratum corneum is slowed, what is the most likely clinical consequence?

Accepted Answer

Delayed wound healing

Question 17

Which of the following best explains why the stratum corneum is effective at preventing water loss?

Accepted Answer

It is composed of dead, keratinized cells and lipids

Question 18

A patient presents with a pigmented lesion that has changed in color and shape over several months. Which diagnostic step is most appropriate?

Accepted Answer

Biopsy and histological examination

Question 19

Which of the following statements about the stratum granulosum is correct?

Accepted Answer

It contains cells that begin to die and release lipids

Question 20

If the thickness of the stratum corneum ($$C) $$increases due to chronic friction, which equation best describes the relationship between $$C$$ and the rate of desquamation ($$D$$), assuming an inverse relationship?

Accepted Answer

$$D = k/C$$

Epidermal Sublayers and Skin Cancer: Structure and Clinical Relevance

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