Can you help me do 7? Thanks. 7 Shits 7. You expose the above microbes to UV lig
ID: 195252 • Letter: C
Question
Can you help me do 7? Thanks.
7 Shits 7. You expose the above microbes to UV light for three different lengths oft obtain the following results Time ofExposure Organism! 30 second Organism? Organism 3 Moderate growth Lots of growth on Complete lawn of growth (50 colonies) 60 seconds 120 seconds 5-colonies No growth exposed area of plate 500 colonies Complete lawn of growth Complete lawn of growth 200 colonies a. Which organism is most resistant to UV light? (2) 2 ov ganism b. Propose a reason to explain why one organism is more resistant than the other organisms. (1) has Cry awn-negatrive will be move vesistenl than ofhws that have rvam (asthve. 8. In the Skin flora lab you have a bunch of colonies growing on the TSY plate that was incubated aerobically. You choose one colony to test further and perform the gram stain. The gram stain reveals gram positive cocci in clusters. a. List the organisms (genus) that could likely be growing on the plate. (2)Explanation / Answer
a. Organism 3 is most resistant to UV light. Here organism 3 shown complete lawn of growth for all length of time. It means UV rays has no effect on the growth of organism 3. Thus, organism three has fully grown upon exposure to UV light for any length of time. While organism 1 and 2 has shown growth for 30 seconds but growth rate is decreasing as the time length of UV exposure is increasing. Hence, organism 3 is most resistant to UV light.
b. UV radiation causes spelling errors in the DNA. Some organisms have strong repair system for these error while some have weak repair system while some do not have any repair system. Here organism 3 has strong repair system for damage (spelling error) caused by UV radiation.