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Published byIsabella Saunders Modified over 11 years ago
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DNA – How it Works Part 1
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Chromosomes are made of DNA…
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DNA has two sides, each made of nucleotides…
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Base Pairs ALWAYS Match Up! Adenine with Thymine and vice versa Adenine with Thymine and vice versa Cytosine with Guanine and vice versa Cytosine with Guanine and vice versa A & G are Purines – double rings A & G are Purines – double rings C & T are Pyrimidines – single rings C & T are Pyrimidines – single rings
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A look at the base pairs…
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DNA Replication – Making a copy…
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How it works… Helicase (an enzyme) unzips the DNA Helicase (an enzyme) unzips the DNA Each strand is used as a template to build a complementary strand Each strand is used as a template to build a complementary strand When the complementary strand is complete, it twists with the template strand to form a new double helix!! When the complementary strand is complete, it twists with the template strand to form a new double helix!! (Look at your coloring!!) (Look at your coloring!!)
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Also, keep in mind… The Point where the double helix separates is called the replication fork (looks like a Y) The Point where the double helix separates is called the replication fork (looks like a Y) Enzymes called DNA polymerase move along each strand adding the corresponding nucleotides! Enzymes called DNA polymerase move along each strand adding the corresponding nucleotides!
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New DNA – Exactly like the old!
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You tell me the complimentary strand… ATGGCGTCATGCTTAGATTACA ATGGCGTCATGCTTAGATTACA TACCGCAGTACGAATCTAATGT TACCGCAGTACGAATCTAATGT
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