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Imagine you are a student in Alfred Hershey and Martha Chase's lab in the late 1940s. You are given five test tubes containing E. coli bacteria infected with T2 bacteriophages that have been labeled with either ³²P or ³5S. Unfortunately, you forgot to mark the tubes and are uncertain about which were labeled with ³²P and which with 35S. You place the contents of each tube in a blender and turn it on for a few seconds to shear off the phage protein coats. You then centrifuge the contents to separate the protein coats and the cells. You check for the presence of radioactivity and obtain the following results. Which tubes contained E. coli infected with ³²P- labeled phage? Explain your answer. Tube number 1 2 3 4 5 Radioactivity present in Cells Protein coats Protein coats Cells Cells

Imagine you are a student in Alfred Hershey and Martha Chase's lab in the late 1940s. You are given five test tubes containing E. coli bacteria infected with T2 bacteriophages that have been labeled with either ³²P or ³5S. Unfortunately, you forgot to mark the tubes and are uncertain about which were labeled with ³²P and which with 35S. You place the contents of each tube in a blender and turn it on for a few seconds to shear off the phage protein coats. You then centrifuge the contents to separate the protein coats and the cells. You check for the presence of radioactivity and obtain the following results. Which tubes contained E. coli infected with ³²P- labeled phage? Explain your answer. Tube number 1 2 3 4 5 Radioactivity present in Cells Protein coats Protein coats Cells Cells

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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1. Imagine you are a student in Alfred Hershey and Martha Chase's lab in the late 1940s. You are given five test tubes containing E. coli bacteria infected with T2 bacteriophages that have been labeled with either ³2P or ³5S. Unfortunately, you forgot to mark the tubes and are uncertain about which were labeled with 32P and which with ³5S. You place the contents of each tube in a blender and turn it on for a few seconds to shear off the phage protein coats. You then centrifuge the contents to separate the protein coats and the cells. You check for the presence of radioactivity and obtain the following results. Which tubes contained E. coli infected with 32P- labeled phage? Explain your answer. Tube number 1 2 3 4 5 Radioactivity present in Cells Protein coats Protein coats Cells Cells
Transcribed Image Text:1. Imagine you are a student in Alfred Hershey and Martha Chase's lab in the late 1940s. You are given five test tubes containing E. coli bacteria infected with T2 bacteriophages that have been labeled with either ³2P or ³5S. Unfortunately, you forgot to mark the tubes and are uncertain about which were labeled with 32P and which with ³5S. You place the contents of each tube in a blender and turn it on for a few seconds to shear off the phage protein coats. You then centrifuge the contents to separate the protein coats and the cells. You check for the presence of radioactivity and obtain the following results. Which tubes contained E. coli infected with 32P- labeled phage? Explain your answer. Tube number 1 2 3 4 5 Radioactivity present in Cells Protein coats Protein coats Cells Cells
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