SU: DNA
• The diagram shows Rosalind
Franklin’s x-ray diffraction image
of DNA. How did this evidence
affect the work of Watson and
Crick?
– A. It was used to determine the
physical structure of DNA.
– B. It was used to identify the four
bases that make up DNA.
– C. It was used to develop the theory
of independent assortment.
– D. It was used to show that DNA
was the molecule of inheritance.
Class Business
• Gattaca Essay Due tomorrow – 30 HP!
• Writing across the curriculum prompt due
tomorrow:
– In one paragraph describe photosynthesis!
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•
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Outline 12-2 Due on Tuesday (5HP)
Reading Quiz 12-2 on Tuesday
Outline 12-3 Due Thursday (10HP)
Reading Quiz 12-3 on Friday
HOMEWORK
• Gattaca Essay Due tomorrow – 30 HP!
• Writing across the curriculum prompt due
tomorrow:
– In one paragraph describe photosynthesis!
•
•
•
•
Outline 12-2 Due on Tuesday (5HP)
Reading Quiz 12-2 on Tuesday
Outline 12-3 Due Thursday (10HP)
Reading Quiz 12-3 on Friday
SU: Base-Pairing
• Which base sequence in DNA is
complementary to the base
sequence TATCGG
–A. ATAGCC
–B. UCUATT
–C. GCGUTT
–D. ATACAA
–Hint: Use Chargaff’s Rule
Classroom Business
• GATTACA Essay/ Genetic Engineering
Essay
• Writing across the curriculum: In one
paragraph describe the process of
photosynthesis
• Outline 12-2 Due Tuesday, Quiz Tuesday
• Outline 12-3 Due Thursday, Quiz Friday
• No school tomorrow.
• Sub on Monday:
– Use the workbooks. Section 12-2
DNA – deoxyribonucleic acid
3 Functions of DNA:
1. To store and use information to
direct the activity’s of the cell
2. To copy itself exactly in order to
form new cells
3. Must be able to pass copies of
their DNA to offspring in order to
keep species from going extinct
DNA Nucleotides
• Made of 3 parts:
1. phosphate molecule
2. sugar molecule – deoxyribose
3. nitrogen base – can be 1 of the 4 below:
- adenine
- thymine
- cytosine
- guanine
**sugar & phosphate molecules are
ALWAYS THE SAME IN EVERY NUCLEOTIDE
Create your own DNA Molecule
• On the back of your nucleotide
handout write..
– 3 Red “A” - Adenine
– 3 Green “T” - Thymine
– 3 Blue “C” – Cytosine
– 3 Yellow “G” – Guanine
– 12 Black “Phosphate Groups”
– 12 White “ Sugar” - Deoxyribose
Directions to make your own
DNA Model
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Follow Chargoff’s Rules!
Step 1: Cut out templates.
Step 2: Cut your nucleotides
Step 3: Pair your nucleotides together.
Step 4: Link them together with the
sugar and phosphate groups.
• Step 5: Sit back and look with awe at
your completed DNA molecule.
Answer the following questions in your
notebook…
• Choose one side of your DNA molecule to be
your leading strand.
– What is your final DNA sequence?
• What is your final complementary sequence?
– This is the DNA strand that is opposite your leading
strand.
• Make a prediction what would happen if you
made a mistake in your DNA molecule. Would
the structure be different? Would the nucleotides
match?
• What do you think happens when this occurs
inside your cells?
HOMEWORK
• Gattaca Essay Due tomorrow – 30 HP!
• Writing across the curriculum prompt due
tomorrow:
– In one paragraph describe photosynthesis!
•
•
•
•
Outline 12-2 Due on Tuesday (5HP)
Reading Quiz 12-2 on Tuesday
Outline 12-3 Due Thursday (10HP)
Reading Quiz 12-3 on Friday
SU: DNA Structure
• The two chains of a DNA molecule
are held together by bonds
between…
– A. Base Pairs
– B. Sugars and Phosphates
– C. Amino Acids
– D. Nucleotides
Class Business
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•
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•
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Outline 12-2 Due Today
Reading Quiz 12-2 Quiz Today
Outline 12-3 Due Thursday
Reading Quiz 12-3 Friday
DNA Molecule
Review: Structure of DNA
Section 12-1
Nucleotide
Hydrogen
bonds
Sugar-phosphate
backbone
Key
Adenine (A)
Thymine (T)
Cytosine (C)
Go to
Section:
Guanine (G)
Section 12-1
Review: DNA Nucleotides
Adenine
Guanine
Cytosine
Go to
Section:
Phosphate group
Thymine
Deoxyribose
Structure of Chromosomes
• Vocabulary
–Chromatin
–Histones
DNA Replication
• Vocabulary
–Replication
–DNA Polymerase
Homework
• Outline 12-3 Due Thursday
• Reading Quiz 12-3 on Friday
3:2:1 Exit Slip
• 3 Things you learned
today
• 2 Things that you did not
expect
• 1 Question for further
inquiry