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DNA
Chapter 4 Section 1 Notes
The Pieces of the Puzzle
_______- deoxyribonucleic acid
- found in all _______ cells
- contains information for ________
passed on from parents to offspring
*Must be able to give ___________
* Must be able to be __________
The Pieces of the Puzzle
Nucleotides: The Subunits of DNA
____________- part of DNA
- made of:
-________
-phosphate
-nitrogenous base
-4 bases
______ (A)
thymine (T)
______ (G)
cytosine (C)
The Pieces of the Puzzle
Chargaff’s Rules
 Erwin Chargraff
 1950’s
 Biochemist
 Adenine = _______
 Guanine = _______
The Pieces of the Puzzle
Franklin’s Dicscovery
 Rosalind Franklin
 Made images of DNA
 X-Ray _____________
 Suggested DNA had ______
shape
The Pieces of the Puzzle
Watson and Crick’s Model
 James Watson and Francis Crick
 DNA must be long twisted ___________
 Built first model
 Fit Chargraff’s and Franklin’s findings
 Helped explain how DNA is ___________
A Place in History
 Imagine you have just discovered the
structure of DNA. Wow!! What do
you do know???
 You are going to make a poster to
present your findings to fellow
scientists. You will be working with
your lab islands on this activity.
 Must have:
 Model of DNA
 Description (be detailed)
 Tell how you discovered it
 Your names
DNA’s Double Structure
 Double _________
 Twisted ladder
 Two sides
 Alternating _____ & phosphate
 Rungs
 Pair of ________
 Adenine with thymine
 Cytosine with guanine
 Matching bases always
present in _____ amounts
Making Copies of DNA
 DNA __________ (copies)
 Base pairs are complementary
 CGAC bonds with __________
Making Copies of DNA
How Copies Are Made
 DNA “_______” down middle of
________ pairs
 Single bases have new
_______________ bases paired
with them
 On new strands of DNA
half is “new” and half is “old”
 http://www.zerobio.com/drag_gr9/DNA/dn
a.htm
Making Copies of DNA
When Copies Are Made
 Copied every time a cell _________
 Each cell gets a copy
 Job is done by ___________