Presentation on theme: "Our Questions about DNA?"— Presentation transcript:
1Our Questions about DNA? What does DNA look like?How is DNA made?How do we know DNA has the instructions to make proteins?How does DNA instruct the cell to make proteins?WHAT DETERMINES THE ORDER OF AMINO ACIDS IN A PROTEIN???
2Do the cells in your eye and your tongue have the same functions? Do the cells in your eye and your tongue have the same proteins?
3Do the cells in your eye and your tongue have the same DNA?
4Humans have 46 chromosomes- where are they? Do all cells have DNA?Do all cells have the same DNA?
5When doing DNA identification (think CSI) does it matter which cells you use to get the sample? Cheek cells? Red Blood cells? Hair follicle cells?
6What changes occur to a salmon when it spawns? Do the salmon’s proteins change when it spawns?
8Does the DNA in your body change as you go through puberty?
9Does the DNA in your body change as you go through puberty?
10Writing assignment Do different cells in your body have different DNA? What makes you think that?Does the DNA in your cells change as you develop from a baby to an adult?
11What have we learned?Proteins determine most characteristics of a cell and organismInformation stored in DNA determines which proteins can be made by a cellThe environment influences which proteins are made by a cell
12Some things we will learn… Where is protein made in a cell?How does the information stored in DNA determine which proteins can be made in a cell?How is protein made in a cell?How does the environment influence which proteins are made in cell?
14DNA does not leave the nucleus of eukaryotic cells DNA does not leave the nucleus of eukaryotic cells... but proteins are made outside of the nucleus by ribosomesElodea leaf cellhuman cheekcellmitochondriachloroplastsvacuolenucleus(DNA here)(DNA here)
15DNA does not leave the nucleus of eukaryotic cells DNA does not leave the nucleus of eukaryotic cells... but proteins are made outside of the nucleus by ribosomesribosomes(proteins made here)(proteins made here)nucleus(DNA here)(DNA here)
16DNA and ribosomes are at different locations in a prokaryoic cell. E. coli bacteria cellribosomes(proteins made here)DNA
17Add ribosomes to the diagrams you have been keeping in your notebook Plant cell- elodea leaf cellAnimal cell- human cheek cellProkaryote- E. coli bacteriumRibosomes make protein but are not in the same location as DNA in a cell. Discuss ideas with your classmates about how the proteins could be made according to the DNA information.
18Information flow from DNA to trait Observed traitDNAproteinMade by ribosomes outside of nucleusStored in nucleus
19messenger RNAmRNA transfers information from the DNA in the nucleus to the ribosomes.Ribosomes build proteins according to the mRNA information received.
20Information flow from DNA to trait messengerRNAObserved traitDNAproteinMade by ribosomes outside of nucleusStored in nucleus
21DNA information mRNA information messengerRNADNATranscription is the process used to convert DNA information into mRNA information.Note: DNA does not become RNA; the information in DNA is copied as RNA