dna – how it works part 1 the importance of dna clickthe importance of dna
TRANSCRIPT
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DNA – How it WorksPart 1Part 1
•The importance of DNA click
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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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Another look at the nucleotide…
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Base Pairs ALWAYS Match Up!
Adenine with Adenine with ThymineThymine and vice versa and vice versa Cytosine with Cytosine with GuanineGuanine and vice versa and vice versa
A & G are A & G are PurinesPurines – – doubledouble rings rings C & T are C & T are PyrimidinesPyrimidines – – singlesingle rings 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… HelicaseHelicase (an enzyme) (an enzyme)
“unzips” the DNA“unzips” the DNA
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How it Works, con’t… Each strand is used as aEach strand is used as a template template to build a to build a
complementarycomplementary strand strand When the complementary strand is When the complementary strand is
complete, it twists with the template strand complete, it twists with the template strand to form a new to form a new double helixdouble helix!!!!
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Replication of DNA
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•Replication of DNA
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Also, keep in mind… The Point where the double helix separates The Point where the double helix separates
is called the is called the replication forkreplication fork ( (looks like alooks like a Y) Y)
Enzymes called Enzymes called DNA polymeraseDNA polymerase move move along each strand adding the corresponding along each strand adding the corresponding nucleotides!nucleotides!
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New DNA – Exactly like the old!
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You tell me the complimentary strand… ATGGCGTCATGCTTAGATTACAATGGCGTCATGCTTAGATTACA
TACCGCAGTACGAATCTAATGTTACCGCAGTACGAATCTAATGT