SBI4U: The Structure of DNA
SBI4U: The Structure of DNA
DNA
• Deoxyribonucleic Acid
• A polymer of many ______________________________
Nucleotides
• Three main components:
1. _________________________
2. _________________________
3. _________________________
• The identity of a nucleotide is determined by its _____________________
2 Types of Nucleotides:
1. Purines: ___________________________________
2. Pyrimidines: ________________________________
***Differences in the sequence of nucleotides are the source of ___________________ between individuals and organisms
Nucleotide Structure:
• Ribose – ________________________
• Carbon naming:
Clockwise
Start at C to the right of O
DNA Composition: Chargaff Experiment (1949)
• Chemical analysis:
Proportion of adenine in DNA is _______________________________
Proportion of guanine is equal to __________________
# of ____________ = # of ____________________
DNA Structure
Rosalind Franklin and Maurice Wilkins
• _________________________________________ (imaging technique)
James Watson and Francis Crick
• Used X-ray diffraction pattern ________________________________
• Combined with information from ________________________
• Developed the ____________________ model of DNA
Who got the Nobel Prize in 1962? _______________________________________
Why didn’t Rosalind Franklin get it?
The Double Helix
Two ____________________ strands of nucleotides
• ____________, but running in opposite ___________
• 3`end (_______________)
• 5`end (_______________)
• The two strands wind around each other
o _________________ structure
• Clockwise direction
• One complete turn of the helix :
o ________________
o ________________
• Helix is ______________ in diameter
• _____________________ backbone
• Nitrogenous bases facing in
Bases are paired with one another:
_____________________ pairing
*Use Pg. 214 to label a phosphodiester bond, glycosyl bond, and Hydrogen bond on the image above.
Complementary Base Pairing
▪ __________________ bonds
▪ purine + ____________________
▪ A-T (_______________)
▪ G-C (_______________)
▪ this pairing is crucial for the storage
and transfer of genetic information
How do we write a DNA strand?
• Write only the ________strand... why?
▪ Can easily deduce the ______________
___________________________________
Homework: Pg. 216 Q. 1-3, 5-7
................
................
In order to avoid copyright disputes, this page is only a partial summary.
To fulfill the demand for quickly locating and searching documents.
It is intelligent file search solution for home and business.
Related searches
- the structure of membranes worksheet
- structure of dna answer key
- structure of dna worksheet answers
- structure of dna worksheet
- structure of dna khan academy
- structure of dna description
- explain the structure of dna
- briefly describe the steps of dna replication
- outline the structure of the constitution
- the structure of dna answers
- 8 2 structure of dna answers
- 12 2 the structure of dna workbook answers