Biology (B3) All of biology (Section B3) 4.0 / 5 based on 1 rating ? ScienceBiologyGCSEAll boards Created by: May LivingstonCreated on: 14-04-11 10:23 Cells and DNA What is found in both plant and animal cells? Nucleus Cell Membrane Cytoplasm - Gel like solution containing enzymes Mitochondria What is found only in plant cells? Chloroplasts - Where photosynthesis takes place Rigid cell wall of cellulose (Support) Large vacuole - Contains cell sap and helps with support 1 of 5 Cells and DNA By which process to do all living organism get their energy? Respiration Where does this process take place? Mitochondria What is the word equation for this process? Glucose + Oxygen - Water + Carbon Dioxide (+ Energy) 2 of 5 Cells and DNA Where is DNA found? Nucleus Describe the structure of DNA: Two strands (Double Helix) that contain lots of nucleotides Each nuceoltide contians small molecules called bases (A& T / C&G) What happens during DNA replication? DNA copies itself everytime a cell divides Double Helix 'unzips' to form to single strands DNA unwides and new nucleotides join where the bases fit Result = Two molecules of identical DNA 3 of 5 DNA fingerprinting What is genetic fingerprinting used for? Pinpointing individuals DNA is unique so used to compare samples of DNA Used in foresic science - Crime scenes Used in paternity tests How does it work? Isolate DNA from the cells Use special enzymes to cut DNA into fragments (Cut at every place they regonise the order of bases) DNA seperated using a process like chormotography - Suspended in gel, electric current passed through, DNA -ve so atttacted to +ve anode DNA tagged with radioactive marker Placed into photographic film, where it is dark thats were radioactivity is Smaller bits move further throught so position of DNA revealed 4 of 5 Protein Synthesis Describe DNA 5 of 5
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