The graph that follows shows the survival of four different E. co...

Question

The graph that follows shows the survival of four different E. coli strains after exposure to increasing doses of ultraviolet light. The wild-type strain is normal, but the other strains have a mutation in either a gene called uvrA, a gene called recA, or both. (b) What are the relative contributions of these genes to the repair of UV damage?

Accepted Answer

Hello everyone and welcome to today's video. So ultraviolet radiation is considered dangerous because it can cause mutations which of the following is a useful impact of UV radiation on humans. Remember that one source of UV radiation can be sunlight. So keep that in mind as we solve the problem. Let's begin by answer choice A. It damages the skin. Well as we will know if we stay in the sun for too long we're going to get sunburn and this is damage to our skin. This is not really useful. So we're going to cancel it out. Then we have answer choice C. It helps in DNA repair. Well this UV light is very microscopic so it can enter or cells nucleus and damage or D. N. A. It is not really going to repair it but damage it. And these can lead to mutations or certain illnesses such as cancer. So this is why it is very important to protect ourselves against just prolonged exposure to sunlight. This is not really a useful impact. So we're going to cancel it out and then we have answer choice B. It helps in vitamin the production. Well as it turns out the sunlight are going to strike a protein called seven D. H. C. And by striking this protein, they're going to turn it into vitamin D. Three which is the active form of vitamin D. Because of this UV radiation can actually be useful for humans in the production of vitamin D. Three. So answer choice B. It helps in vitamin D. Production is the correct answer to our question. I really hope this video helped you and I hope to see you in the next one.

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