Lec5_DNA.ppt - LECTURE 5 DNA RNA PROTEINS The molecules of life Today DNA structure and replication RNA Transcription Translation Protein synthesis

Lec5_DNA.ppt - LECTURE 5 DNA RNA PROTEINS The molecules of...

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LECTURE 5:LECTURE 5:DNA, RNA & PROTEINSDNA, RNA & PROTEINSThe molecules of life
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Today…DNA structure and replicationRNATranscriptionTranslationProtein synthesisAmino acids
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DNADNADeoxyribonucleic Acid(DNA) is the blueprint for life: contains __________________________
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DNA structureDNA is a polymer of nucleotidesEach nucleotide composed of ___________________________________________________
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Four DNA basesFour kinds of nitrogenous bases:Purine basesPyrimidine bases
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DNA: Complimentary base pairingAdenine pairs with ________A Cytosine pairs with _________C
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DNA STRUCTUREDNA is a ________ helix Discovered by Watson and Crick, 1953
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DNA REPLICATION (in the nucleus)Each DNA strand becomes a _____________, parent strand becomes apartProper base-pairs areassembled on that template
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DNA replicationNucleotides are connected together to make a new strand that is ____________ to the old strand.The new double strand is _________ to the old double strandThis is called ________________________replication
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A-T vs.G-C bondA-T is a doublebond…C-G is a ______ bond (stronger)…DNA double strand can separate into 2 single strands when heated.Which strand would require more heat (more energy) to separate: an A-T rich or a C-G rich double strand?
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RNA structure and synthesisRNA: ___________________Is very similar to DNA (repeating subunits, nucleotides).Difference between RNA and DNA:Each nucleotide contains a different sugar: ____________instead of deoxyribose.Bases are A, G, C, and U (_________________) A pairs with ______; G pairs with ______
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RNARNA is _________ stranded and shorterRNA is less stable than DNA: RNA doesn’t persist in the cell for long (sometimes it exists for a few seconds),whereas DNA can persist for the life of thecell.
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