DNA: Structure and Replication. Two Types of Nucleic Acids. Slide # 2. Nucleic Acids : carry the genetic instructions for all life. Discovery of Nucleic Acid. Slide # 3. 1869: Friedrich Miescher discovered nuclein Noticed that nuclein had a lot of phosphate
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Nucleic Acids: carry the genetic instructions for all life
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Oswald Avery continued Griffith’s experiment!
Avery showed that DNA is the transforming agent!
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DNA is made up small, repeating units (monomers) called nucleotides.
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Source of DNA A T G C
Streptococcus 29.8 31.6 20.5 18.0
Yeast 31.3 32.9 18.7 17.1
Herring 27.8 27.5 22.2 22.6
Human 30.9 29.4 19.9 19.8
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-- Applied Chargaff’s rules
Quote:Whatever you are, be a good one!
Agenda: Homework check
DNA structure cont.
Cell Division notes
1. Which of the following best describes cellular respiration?
a. External breathing
b. Breakdown of sugar to release energy in cells
c. Movement of water from outside the cell to inside the cell.
d. Removal of water from a cell
2. Describe the structure and components of a DNA nucleotide.
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Parent strand: gray
Daughter strand: red
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Strands are antiparallel
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Karyotype of Human
Chromosome:coiled DNA & protein “spacers” called histones.
Histones keep the chromosome from getting tangled.