The Hershey-Chase Experiment
Alfred Hershey and Martha Chase's definitive experiment using bacteriophages and radioactive isotopes to prove that DNA, not protein, is the genetic material.
What is The Hershey-Chase Experiment?
A type of virus that infects bacteria.
Key points
- Understand the experimental design of Hershey-Chase.
- Identify the role of radioactive labeling in the experiment.
- Explain how the results supported DNA as the genetic material.
- Differentiate between protein and DNA in terms of their composition and role in heredity.
Common exam trap
Confusing which isotope labels which component (³⁵S for protein, ³²P for DNA).
Definitions
- Term
Bacteriophage
- Meaning
A type of virus that infects bacteria.
- Term
Radioactive Isotope
- Meaning
An atom with an unstable nucleus that emits radiation during decay; used to trace molecules in biological systems.
- Term
Centrifugation
- Meaning
A process using centrifugal force to separate components of different densities.
Learning objectives
Understand the experimental design of Hershey-Chase.
Identify the role of radioactive labeling in the experiment.
Explain how the results supported DNA as the genetic material.
Differentiate between protein and DNA in terms of their composition and role in heredity.
Prerequisites
Basic understanding of viruses (bacteriophages).
Knowledge of bacterial cell structure.
Familiarity with radioactive isotopes and their use in tracing molecules.
Concept of genetic material.
Common mistakes
Confusing which isotope labels which component (³⁵S for protein, ³²P for DNA).
Misunderstanding the role of the blender and centrifuge.
Not recognizing that only the genetic material enters the host cell.
Attributing the genetic material to protein instead of DNA.
Keywords
Hershey-Chase Experiment
DNA
Genetic Material
Bacteriophage
Radioactive Isotopes
³⁵S
³²P
Blender Experiment
Molecular Biology
Genetics
Practice preview
What was the purpose of using Phosphorus-32 (P-32) in the Hershey-Chase experiment?…
easy
Which organism was used by Alfred Hershey and Martha Chase as the host for bacteriophage infection?…
easy
Arrange the steps of the Hershey-Chase experiment in the correct chronological order as per NCERT.…
medium