biology b2
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Biology B2. Lesson 3: DNA. Connect. On each post-it, write one fact that you think you already know about DNA . Stick this on your desk. Collect an exam question. Connect. DO NOT ANSWER the exam question. Instead, write your own ‘Walking Talking’ Notes onto it. What Are We Learning?. - PowerPoint PPT PresentationTRANSCRIPT
ConnectOn each post-it, write one fact
that you think you already know about DNA.
Stick this on your desk.
Collect an exam question.
What Are We Learning? By the end of this lesson, you should:
Be able to describe the structure of DNA.
Be able to explain how DNA codes for amino acids.
Consider the importance of the discovery of DNA.
SMSC & RWCM Cultural: Consider the reasons why some
discoveries are more important than others.
Social: Respect the views of others.
Reading: Identify key facts.
Writing: Use key words in the correct context.
Progress Step 1:
Be able to describe the
simple structure of DNA and use
some key words.
Progress Step 3:
Describe the structure and
function of DNA
Progress Step 2:
State the key parts of a DNA
molecule.
Increasing Difficulty
Today’s Learning
Starting Points DNA stands for Deoxyribose Nucleic
Acid.
Think: What is the structure of DNA?
Why is DNA so important?
DNA: The Basics Deoxyribose Nucleic Acid can be
descibed as having a coiled double helix shape.
It is unique because it is able to replicate.
DNA: The Basics Each strand of
DNA is made up of a combination of four bases.
The order in which each of these pairs appears is important.
DNA: The Basics The four bases on
one strand line up against the other strand always in the following pairs:
Adenine - Thymine Guanine - Cytosine
DNA: The Basics The four base pairs
are joined by Hydrogen bonds, which can be easily ‘unzipped’.
What do you know about hydrogen bonds?
DNA: The Basics Each triplet of bases on one strand of
DNA codes for an amino acid.
How many combinations of bases can you come up with in four minutes?
DNA: Task How many amino acids are there in this
section of DNA? Use colours to identify them.
-C-G-C-A-A-T-C-G-T-A-T-A-G-C-G-A-A-C-
What would be the opposite strand of this DNA?
DNA: Task How many amino acids are there in this
section of DNA? Use colours to identify them.
-C-G-C-A-A-T-C-G-T-A-T-A-G-C-G-A-A-C-
What would be the opposite strand of this DNA?
-G-C-G-T-T-A-G-C-A-T-A-T-C-G-C-T-T-G
Discovering DNA DNA was first modelled in 1953 by
James Watson & Francis Crick.
There is an argument that this was the most important scientific discovery of the the 20th Century.
The Nobel Prize in Physiology or Medicine was awarded in 1962 to Watson, Crick and Maurice Wilkins.
Discovering DNA: Task Use the information in the text to
produce a timeline for the discovery of DNA.
Start with the earliest events.
When you are happy, decide which events were the most significant.
Questions Which discovery contributed the most
to the work of Watson & Crick? Why was Erwin Chargoff’s work an
important contribution to the deduction of the structure of DNA?
Why was the structure of DNA seen as such an important scientific development?
Franklin: A Victim Of Sexism? Franklin is best known for her work on the
X-ray diffraction images of DNA which led to the discovery of DNA double helix.
Her data, according to Francis Crick (Nobel Prize Winner), were "the data we actually used” to formulate Crick and Watson's 1953 hypothesis regarding the structure of DNA.
What do you think about this?
What Are We Learning? By the end of this lesson, you should:
Be able to describe the structure of DNA.
Be able to explain how DNA codes for amino acids.
Consider the importance of the discovery of DNA.