Lecture_2

14 dna structure movie dna replication movie

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14 DNA structure movie http://www.youtube.com/watch?v=qy8dk5iS1f0 DNA replication movie http://www.youtube.com/watch?v=hfZ8o9D1tus&NR=1
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15 Relationship between Nucleus, Chromosomes and DNA
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16 Each human cell contains 23 pairs of chromosomes
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17 Genes = exons + introns Exons = coding regions encode proteins Introns = non-coding regions spliced out in RNA Many genes = chromosome Genes and chromosomes
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18 The Human Genome • DNA of human genome = organized into chromosomes • Humans have _____ pairs of chromosomes • Chromosome = a single piece of DNA that contains many genes • Gene = unit that codes for 1 protein • Genes contain introns (non-coding/regulatory elements) and exons (coding sequences) On average, a single human chromosome consists of a DNA molecule that is almost 5 cm long
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20 DNA Double Helix winds up into Chromosomes Genes
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21 1st half = DNA wrapping/2nd half = replication movie http://www.youtube.com/watch?v=E8NHcQesYl8
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22 Tri-nucleotide units called codons , each coding for a single amino acid. Codons = words = amino acid Proteins have unique amino acid sequence 4 x 4 x 4 = 64 possible codons Translation = RNA to protein DNA to RNA = transcription RNA Nucleotides (A C G U) = alphabet
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23
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25 DNA transcription and translation movie http://www.allaboutscience.org/dna-double-helix-video.htm (Epic) (Condensed)
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14 DNA structure movie DNA replication movie

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