A spaceship lands on Earth, bringing with it a sample of extraterrestrial bacteria. You are assigned the task of determining the mechanism of DNA replication in this organism. You grow the bacteria in an unlabeled medium for several generations and then grow it in the presence of for exactly one generation. You extract the DNA and subject it to CsCl centrifugation. The banding pattern you find is as follows: 11eb5dbf_7dd7_e726_b032_5bdbad0b1be4_SM1308_00 It appears to you that this pattern is evidence that DNA replicates in the semiconservative manner, but you are wrong. Why? What other experiment could you perform (using the same sample and technique of CsCl centrifugation) that would further distinguish between semiconservative and dispersive modes of replication?

iGenetics 3rd Edition by Peter Russell

النسخة 3الرقم المعياري الدولي: 978-0321569769

iGenetics 3rd Edition by Peter Russell

النسخة 3الرقم المعياري الدولي: 978-0321569769

تمرين 3

A spaceship lands on Earth, bringing with it a sample of extraterrestrial bacteria. You are assigned the task of determining the mechanism of DNA replication in this organism.
You grow the bacteria in an unlabeled medium for several generations and then grow it in the presence of for exactly one generation. You extract the DNA and subject it to CsCl centrifugation. The banding pattern you find is as follows:

It appears to you that this pattern is evidence that DNA replicates in the semiconservative manner, but you are wrong. Why? What other experiment could you perform (using the same sample and technique of CsCl centrifugation) that would further distinguish between semiconservative and dispersive modes of replication?

التوضيح

موثّق

Even if the deoxyribonucleic acid (DNA) ...