information of life

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  • Information Of Life
    • DNA
      • Stands for DEOXYRIBOSE NUCLEIC ACID
      • five carbon sugar is DEOXYRIBOSE
      • usually much longer than RNA
      • DNA replicates by the semi-conservative method
      • made up of 2 polynucleotide strands
      • the nucleotides that DNA contain are: Adenine, Guanine, Cytosine and Thymine
    • RNA
      • Stands for RIBONUCLEIC ACID
      • Uracil pairs with Adenine
      • The nucleotides that RNA contains are:Adenine, Guanine, Cytosine and URACIL
      • The five carbon sugar of RNA is RIBOSE
      • Is a SINGLE polynucleotide strand
      • is much shorter than DNA
    • SEMI-CONSERVITIVE MODEL
      • 1ST STAGE: DNA molecule unzips, the hydrogen bonds between bases break
      • 2ND STAGE: new nucleotides align alongside their complementary bases
      • 3RD STAGE: an enzyme called polymerase joins these new nucleotides
      • 4TH STAGE: each new strand is complementary to the old strand and each of the new molecules formed is identical
      • 5TH STAGE:  DNA replication occurs during interphase, before all cells divide by mitosis
      • in this model one strand of the old molecule is kept intact, and the other strand is newly made
    • BITS AND BOBS  I NEED TO KNOW
      • human body cell has 23 pairs of chromosomes
      • genes occur at the same relative locus on homologous chromosomes
        • thses paired chromosomes are not completely identical, but they carry the same genes
      • homologous chromosomes are a pair of chromosomes which have the same genes but different alleles
      • a long polynucleotide strand is formed : the phosphate and sugars from adjacent nucleotides join together by condensation reactions
      • hydrogen bonds bond netrogenous bases together
      • A gene is a section of DNA that codes for one protein and carries coded info about a characteristic
      • Nucleotide is the name for a polymer made up of repeated units

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