section12.2. 3. dna (deoxyribonucleic acid) is a nucleic acid made up of nucleotides joined into...
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3. Nucleotides are building blocks of nucleic acids 4. Nucleotides: 3 parts ▪ 5. 5-carbon sugar: deoxyribose ▪ 5. Phosphate group ▪ 5. Nitrogenous base ▪ 4. 4 Nitrogenous bases (contain Nitrogen): 5. Adenine 5. Guanine 5. Thymine 5. CytosineTRANSCRIPT
1. Structure of DNASection12.2
2. Components of DNA
3. DNA (deoxyribonucleic acid) is a nucleic acid made up of nucleotides joined into long strands by covalent bonds
2. Nucleotides 3. Nucleotides are building blocks of
nucleic acids 4. Nucleotides: 3 parts▪ 5. 5-carbon sugar: deoxyribose▪ 5. Phosphate group▪ 5. Nitrogenous base
▪ 4. 4 Nitrogenous bases (contain Nitrogen): 5. Adenine 5. Guanine 5. Thymine 5. Cytosine
2. Bonds…James Bonds…jk 3. Nucleotides joined by covalent bonds
4. Forms between sugar of one nucleotide and phosphate group of the next.
3. Nitrogenous bases4. Stick out sideways from the nucleotide chain4. Nucleotides can be joined together in a number of different ways4. Any base sequence is possible4. That’s what makes us so different!4. Have a special chemical structure that is especially good at absorbing UV light
Stop and Write(2-5 min.)
1. What are the 3 components of a nucleotide?
2. What are the four nitrogenous bases?
3. Do you think excessive UV light could damage your DNA? How?
2. Erwin Chargaff
3. Austrian-American biochemist 3. Discovered that % of:
4. Adenine [A]= Thymine [T] 4. Guanine[G]= Cytosine [C]
P. 345 Analyzing data #1-4 (5 min.)
Skipping the people…we will come back to them later!
2. Double- helix
3. Explains Chargaff’s rule 3. Antiparallel strands
4. DNA runs in opposite directions3. Hydrogen bonds
4. Both strands of DNA are held together by H bonds between nitrogenous bases (A and T) and (G and C).
3. Base pairing4. A always lines up perfectly with T 4. G always lines up perfectly with C
Structure Review
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