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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?.

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biology b2

Biology B2

Lesson 3: DNA

connect
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.
connect1
Connect
  • DO NOT ANSWER the exam question.
  • Instead, write your own ‘Walking Talking’ Notes onto it.
what are we learning
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
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.
today s learning
Today’s Learning

Progress Step 1:

Be able to describe the simple structure of DNA and use some key words.

Progress Step 2:

State the key parts of a DNA molecule.

Progress Step 3:

Describe the structure and function of DNA

Increasing Difficulty

starting points
Starting Points
  • DNA stands for DeoxyriboseNucleic Acid.
  • Think:
  • What is the structure of DNA?
  • Why is DNA so important?
dna the basics
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 basics1
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 basics2
DNA: The Basics
  • In DNA, there are four bases. These are:
  • Adenine
  • Guanine
  • Cytosine
  • Thymine
dna the basics3
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 basics4
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 basics5
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
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 task1
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
dna the basic structure
DNA: The Basic Structure

Sugar

Hydrogen Bonds

Phosphate

discovering dna
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
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.
slide19

Rosalind Franklin

Franklin’s “Photograph 51”

Watson & Crick’s ball and stick model

questions
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: 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 learning1
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.
reflection
Reflection
  • Look at your Post It Note from the beginning of the lesson.
  • Review what you wrote and comment upon the accuracy of your original comment.
  • Share one learning point with a neighbour.
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