According to the results, the organism survived the prolonged UV light exposure. Which of the follow reason(s) would explain why this organism can survive for long period of time. (Hint: think about cellular structure(s) that help protect a microbe in hostile environments). According to the results, the organism survived the prolonged UV light exposure. Which of the follow reason(s) would explain why this organism can survive for long period of time. (Hint: think about cellular structure(s) that help protect a microbe in hostile environments). UV Results.jpg The production of specific types of enzymes bolsters the organism's defense mechanism against the effects of UV light. These enzymes play a crucial role in removing thymine dimers from the DNA. The UV light used in the process of sun drying penetrates effectively. The organism's defense mechanism against the effects of UV light is bolstered by the production of specific types of enzymes. These enzymes play a crucial role in preventing thymine dimers from being inserted into the proteins, providing a robust defense. The organism can absorb the UV light and convert the energy into molecules of ADP. The UV light triggers the vegetative cell to sporulation and form endospores for protection. select all that apply
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(4 points) What properties of endospores do you think help them to endure more UV radiation than non-sporulating bacteria? (8 points) Please explain why a human sunbathing too much and too long without sunblock is bad for their skin? While eukaryotic cells are different from prokaryotic cells, draw correlations from the knowledge in this experiment to what could be happening to the skin cells of a sunbather (Hint: central hypothesis). (4 points) While the cells were spread across the whole plate, how was only part of the plate exposed to the UV light? Explain in terms of wavelength what a material has to do in order to block UV light? (example Hints: UV glasses vs. polarized glasses, thick blanket vs clear plastic)
Madhur L.
conducive to active cell metabolism. The soil bacterium Bacillus subtilis, for example, begins the process of sporulation when one or more nutrients are depleted. The end product is a small, metabolically dormant structure that can survive almost indefinitely with no detectable metabolism. Spores have mechanisms to prevent accumulation of potentially lethal mutations in their DNA over periods of dormancy that can exceed 1,000 years. $B$. subtilis spores are much more resistant than are the organism's growing cells to heat, UV radiation, and oxidizing agents, all of which promote mutations. (a) One factor that prevents potential DNA damage in spores is their greatly decreased water content. How would this affect some types of mutations? (b) Endospores have a category of proteins called small acid-soluble proteins (SASPs) that bind to their DNA, preventing formation of cyclobutane-type dimers. What causes cyclobutane dimers, and why do bacterial endospores need mechanisms to prevent their formation?
What is the best explanation for the reason Bacillus cereus is more resistant to UV light than Serratia marcescens? A. Bacillus cereus is gram-negative. B. Bacillus cereus are rod-shaped bacteria. C. Bacillus cereus can form protective spores. D. Bacillus cereus is gram-positive. E. Bacillus cereus has a capsule. 9. How can the damage induced by ultraviolet light be repair? A. Excision repair system B. Either the excision repair system or the light repair system C. Light repair system D. Damage due to ultraviolet light is irreversible E. None of the answer choices. 10. Why are Petri dish covers removed when exposing the inoculated plate to the ultraviolet light source? A. Plastic covers will activate enzymes in the excision repair system. B. Ionizing radiation cannot penetrate plastic. C. Plastic covers will activate enzymes in the light repair system. D. Ultraviolet light will be less effective after having to penetrate through a Petri dish cover. E. Petri dishes will cause more contamination.
Adi S.
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