Quiz: Hom A 5.1150 1 x secure https://usflearn.instructure.com/courses/1194259/q
ID: 223224 • Letter: Q
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Quiz: Hom A 5.1150 1 x secure https://usflearn.instructure.com/courses/1194259/quizzes/1616816ltakelquestions/35795054 E 17 Quizzes Homework 10 Homework 10 Started Mar 24 at 107am Quiz Instructions Select the best answer. allowed Mustone attempt. ONLY QUESTIONS 1.10 ARE GRADED The remaining questions are neney sor 1 pts Mesetion Stuhl exporrimentis performed on bactma auhun What percentage replication include originaltomplain DNA and DNAsynthesiaedin each the three rounds of replation when calcuanne total DNN? No new data to save last decked at 4toum MacBook Air Questions Question 1 QuestionsExplanation / Answer
Choice 1 is correct.
Reason: Meselson's and Stahl's classical experiment was conduct to confirm the nature of DNA replication. By their expriments, these investigators confirmed that DNA replication is semi-conservative. They labelled that DNA with radio-isotopes and allowed the cells to replicate for many generations. At every generation, they noted the radioactive signal from the cells and found that DNA replication was semi-conservative in nature because with every generation, the intensity of radioactive signal declined. If 100% DNA was labelled in generation 1, only 50% cells showed radioactivity in generation 2. Similarly, only 50% of generation 2 i.e. 25% cells showed radioactivity. Similarly only 12.5% of cells showed radioactive signal.
From these experiments, the investigators proved that DNA replication was semi-conservative in nature.
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