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Published byLuke Patterson Modified over 9 years ago
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Wilkins Crick Watson Franklin
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nucleotide
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Why do offspring resemble their parents? The offspring have copies of the parents’ chromosomes Chromosomes contain sets of instructions Those instructions are called GENES Genes are made up of DNA
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In what year was DNA finally concluded to be genetic material? 1944 HINT: D-Day: This is the U.S. Coast Guard at Normandy
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the three parts of a NUCLEOTIDE ? Nitrogen base Phosphate 5-carbon sugar molecule (deoxyribose)
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The letters DNA stand for what words? Deoxyribonucleic acid
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4 different NITROGEN bases Adenine Thymine
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Guanine cytosine
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Class of organic molecules for ADENINE and GUANINE purines LARGE
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Class of organic molecules for thymine and cytosine pyrimidines SMALL
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Purines have how many rings of carbon and nitrogen atoms? 2
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Pyrimidines have how many rings of carbon and nitrogen atoms? 1
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Base-pairing rule Thymine always goes with Adenine Cytosine always goes with Guanine
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Watson, Crick and Wilkins 3 scientists who won the Nobel Prize by understanding the 3-deminsional structure of DNA 1953………Nobel Prize in 1962
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Only males were allowed in the university dining rooms, and after hours Franklin's colleagues went to men- only pubs. Rosalind Franklin
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Describe a double helix Spiral staircase
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In the DNA structure of the ‘twisted ladder’ (spiral staircase) the rungs are held together by what bond? HYDROGEN
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The process of making a new DNA strand is called REPLICATION
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Before REPLICATION can begin The double helix must be UNWOUND
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The UNWINDING of the DNA strand is accomplished by ENZYMES called HELICASES
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Differences between DNA and RNA DNARNA 2 strands of nucleotides Single strand of nucleotides 5-carbon sugar deoxyribose (‘de’ means without an OH ) 5-Carbon ribose (sugar) thymineUracil
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Now you try it Draw 5 pairs of nucleotides, labeling each part.
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