Question

Yeast is a eukaryote thus it can be used as a comparison of our own mammalian cells. In the skin cancer lab, you and your partner devise a way to test the effectiveness of a UV protectant ( sunscreen, sunglasses, etc.). How was the mutant strain of yeast used to demonstrate this effectiveness A. The mutant yeast couldn't repair its own DNA when exposed to the sun B. The mutant yeast cells repaired its DNA when exposed to the sun C. The mutant yeast cells DNA was fried when it was exposed to the sun D. The mutant yeast cells use similar enzymes as humans to repair their DNA E. None of the above

Answer 1

Answer: D

Step-by-step explanation:

Answer 2

The mutant strain of yeast couldn't repair its own DNA when exposed to the sun. This feature makes this strain an ideal candidate for use in testing the effectiveness of UV protectants.

In the context of the skin cancer lab, a mutant strain of yeast was utilized to test the effectiveness of a UV protectant. The mutant yeast in question (A) does not possess the ability to repair its own DNA when exposed to sunlight. Exposure to the UV rays from the sun causes damage to the DNA within the yeast cells, a situation that mimics DNA damage in mammalian cells inflicted by the sun's radiation. Using this mutant yeast strain, a controlled UV exposure experiment can be designed to study the efficacy of different UV protectants. Upon exposure to UV radiation, if the DNA of the yeast fails to repair itself, it indicates that the UV protectant being tested is ineffective.

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