information of life
- Created by: Harriet hope
- Created on: 08-04-13 09:37
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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
- DNA
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