IB Biology Topic A1.2.14 Evidence from the Hershey–chase Experiment for DNA as the Genetic Material Revision Notes (HL)

IB Biology Topic A1.2.14 Evidence from the Hershey–chase Experiment for DNA as the Genetic Material Revision Notes (HL) | RevisionDojo

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The Hershey-Chase Experiment Showed DNA Is the Genetic Material

In the 1950s, scientists were debating one big question: which molecule carries the genetic instructions for life?
Was it protein, known for its complexity, or DNA, a simpler molecule?
Alfred Hershey and Martha Chase settled the debate with a clever experiment.

Tracing DNA and Protein With Radioactive Labels

They used two radioactive isotopes to label the two molecules separately.
1. Phosphorus-32 (³²P) labelled DNA, because DNA contains phosphorus but no sulfur.
2. Sulfur-35 (³⁵S) labelled protein, because protein contains sulfur but no phosphorus.
They grew bacteriophages so that one batch had labelled DNA and the other had labelled protein coats.

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Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
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The Hershey-Chase Experiment Showed DNA Is the Genetic Material

In the 1950s, scientists were debating one big question: which molecule carries the genetic instructions for life?
Was it protein, known for its complexity, or DNA, a simpler molecule?
Alfred Hershey and Martha Chase settled the debate with a clever experiment.

Tracing DNA and Protein With Radioactive Labels

They used two radioactive isotopes to label the two molecules separately.
1. Phosphorus-32 (³²P) labelled DNA, because DNA contains phosphorus but no sulfur.
2. Sulfur-35 (³⁵S) labelled protein, because protein contains sulfur but no phosphorus.
They grew bacteriophages so that one batch had labelled DNA and the other had labelled protein coats.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic A1.2.14: Evidence from the Hershey–chase Experiment for DNA as the Genetic Material Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

The Hershey-Chase Experiment Showed DNA Is the Genetic Material

Tracing DNA and Protein With Radioactive Labels

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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The Hershey-Chase Experiment Showed DNA Is the Genetic Material

Tracing DNA and Protein With Radioactive Labels

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account