What is science? discovery and what is...Maurice Wilkins and Rosalind Franklin - 1951 Wilkins and...
Transcript of What is science? discovery and what is...Maurice Wilkins and Rosalind Franklin - 1951 Wilkins and...
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What is science?
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What is science?
� A bunch of facts?
� A bunch of ideas?
� A class?
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What is science?
� Science is a quest
� A process to gain understanding
� How do we gain understanding?
� Asking questions
� Designing ways to answer questions
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What is science?
� Science builds on the discoveries of the
past
� Cumulative process
� How?
� One question leads to another
� Scientific discovery requires technology
� Example?
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The process of science
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The Discovery of DNA
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People in the past used to wonder…
� Why do children look so much like their
parents?
� Why do animals and plants have traits
similar to their parents?
� How do traits get passed from one
generation to the next?
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People in the past used to wonder…
� People began to suspect it was a physical
molecule transferred from parent to
offspring
� So people started looking for it.
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When did people discover that DNA existed?
� 1869- Johann Freidrich Meischer
� Found in the nucleus of a cell
� No one was really sure what DNA did
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Early 1900’s
� Other scientists discover the nucleotide
components
� Sugar, nucleotide, nitrogenous bases
� As scientists discovered more about DNA
they thought its structure was too simple to
carry the complex information of heredity.
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Time for important scientists
� As you go through these next slides, you
will be searching on the internet to learn
about important scientists
� Use the questions listed on your note sheet to
guide your searches
� Write down important information you find
� Use the links provided but feel free to just search
the web
� Have fun!
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Fredrick Griffith - 1928
� He worked with bacteria that caused pneumonia.
What was he attempting to discover?
� Give a short summary of his experiment with mice and
his results.
� He discovered the principle of transformation. What is
that and how did he come to his conclusion?
� Scitable – Transforming Principle
� Wikipedia – Griffith’s Experiment
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Oswald Avery- 1944
� He was initially skeptical of the results of Griffith’s
research. What did he do as a result?
� What were the results of his experiments?
� National Library of Medicine
� Wikipedia – Avery
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Alfred Hershey and Martha Chase-1944
� Hershey and Chase performed a famous experiment.
What was the purpose of their research?
� Give a short summary of their experiment with viruses
and their results.
� What did they discover from their research?
� Scitable – Hershey and Chase
� Wikipedia – Hershey and Chase Experiment
� Animation – Experiment
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Maurice Wilkins and Rosalind Franklin -1951
� Wilkins and Franklin were working together in the
same lab. What were they working on?
� What were they producing as a result of their efforts?
� Wikipedia – Wilkins
� PBS – Franklin
� Wikipedia - Photo 51
� McGraw-Hill Education Site
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James Watson and Francis Crick -1953� Watson and Crick were working together in the same
lab. What were they working on?
� What did they receive from the Wilkins and Franklin
Lab?
� What did they do that no other person had
accomplished?
� Why has the discovery of DNA structure been so
important? How has it changed science?
� PBS – Watson and Crick
� Scitable – Watson and Crick
� National Library of Medicine
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