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Lec04 - DNA molecule described as double helix WE EXPRESS...

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DNA molecule described as double helix.
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WE EXPRESS OUR DNA as we need it……….
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1. The ENTIRE DNA MOLECULE  can Replicate:  Then You have 2 from 1 (DNA  REPLICATION---Leads to  MITOSIS ..one cell  goes to two cells. OR 2.     Selected sections of the DNA strand   (genes)  can  be expressed ( transcribed and into mRNA  and Translated into proteins)
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We know that it is HIGHLY CONDENSED and  COMPLEXED WITH PROTEINS Called  HISTONES Into complexes called NUCLEOSOMES …see  next 2  SLIDEs. HINT: REMEMBER the actual DNA molecule is a  polymer of nucleotides  as you view the next slide  keep that in mind and watch the molecule  condense and become “complexed” with proteins  into nucleosomes.
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Duplicating Genetic Information Information about you is in the sequence of nucleotides in the DNA molecule In each of your cells, there is about 2 meters of DNA per nucleus How does the DNA condense into such as small area? DNA histones chromatin
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DNA
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Helicases: Unwind DNA Double Strand Primers: Short strand of nucleotides DNA polymerases : position nucleotides  along the template DNA strand DNA Ligases: Splice together short  segments of new 
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Humans Have 46 Chromosomes 23 pairs 2n = 46 2 is the number of copies of each chromosome n = the number of different chromosomes 46 is the total number of chromosomes in the cell 2n is called the DIPLOID NUMBER
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Duplicating Genetic Information
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Duplicating Genetic Information
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Duplicating Genetic Information
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