UV Radiation and Skin Effects Quiz

What type of UV radiation penetrates the dermis and contributes to skin aging and cancer?

• UVC

• UVB

• UVA

• All of the above

Which enzyme group is activated by UV radiation, leading to collagen and elastin breakdown?

• Reactive oxygen species (ROS)

• Metalloproteinases (MMPs)

• Melanin synthesases

• Elastinases

What is a common clinical manifestation of abnormal elastin production due to UV exposure?

• Bruising and purpura

• Wrinkles and sagging skin

• Hyperpigmentation

• Photosensitivity

What kind of DNA damage is commonly caused by UV radiation?

• Chromosomal rearrangement

• Thymine dimers

• Oxidation of DNA bases

• Telomere shortening

Which condition is characterized as a pre-cancerous lesion caused by UV damage?

• Actinic keratosis

• Seborrheic keratosis

• Malignant melanoma

• Basal cell carcinoma

What is a key mechanism by which UV generates free radicals in the skin?

• Interactions with keratinocytes' DNA

• Direct damage to collagen

• Activation of vitamin D synthesis

• Stimulation of melanin production

What type of skin growth is commonly linked to chronic UV exposure but is benign?

• Actinic keratosis

• Squamous cell carcinoma

• Seborrheic keratosis

• Malignant melanoma

What role does p53 signaling play in UV-induced keratinocyte apoptosis?

• Prevents DNA repair

• Triggers programmed cell death to avoid cancerous transformations

• Enhances melanin production

• Promotes skin thickening

Which of the following is NOT a suggested method to prevent UV-related skin damage?

• Sunscreen use

• Protective clothing

• Avoiding hydration

• Seeking shade

Photosensitivity can result in which symptoms after UV exposure?

• Scaly patches

• Mild redness to severe blistering

• Benign warts

• DNA mutations without visible signs