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http://www.math.fsu.edu/~quine/IntroMathBio_04/Proteins/myoglobin_geis.jpg myoglobin
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When DNA copies….. It copy's in a very specific order. It copies 5’-3’ from a 3’-5’ Template.
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That means the DNA strand is in the following order… DNA
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That means the DNA strand is in the following order…
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Double Helix
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Nucleotides: basic molecule of DNA Pyrimidine
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Nucleotides: basic molecule of DNA Purine
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Pyrimidines and Purines Made up of a 1.Sugar (5 carbon) 2.Phosphate group 3.Nitric Base
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DNA Replication http://www.johnkyrk.com/DNAreplication.ht mlhttp://www.johnkyrk.com/DNAreplication.ht ml
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Differences between RNA and DNA RNA has only a SINGLE Strand (DNA is Double Stranded) RNA contains ribose instead of deoxyribose RNA polymerase can start the RNA transcription without a primer
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Differences between RNA and DNA RNA uses Uracil(U) instead of Thymine(T) More errors occur in an RNA copy than in DNA copy of nucleotides (10 3 more than in DNA) FACT: DNA has a transcription error approximately every 10 7 nucleotides. RNA has an error approximately every 10 4 !
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Differences between RNA and DNA WHY are there more errors in RNA Transcription? One of several reasons is that in rare instances Uracil can also bond with Guanine
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Is this a Bad thing? WHY are there more errors in RNA Transcription? One of several reasons is that in rare instance Uracil can also bond with Guanine RNA is a temporary copy in Eukaryotes
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Types of RNA mRNA= messenger RNA codes for a protein
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Types of RNA tRNA= transfer RNA central to protein synthesis as adaptors between mRNA and amino acids
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Types of RNA rRNA= ribosomal RNA form the basic structure of the ribosome and catalyze protein synthesis
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Transcription- the synthesis of RNA under DNA (occurs in the nucleus) Translation- the actual synthesis of a polypeptide coded for by the mRNA. (changing the base sequence of the mRNA molecule into a chain of amino acids that form a polypeptide. For our purposes a protein.)
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An mRNA copy is made from DNA in the Nucleus
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The DNA strand from which the mRNA is copied is the TEMPLATE STRAND
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The mRNA leaves the nucleus and enters a ribosome (made up of rRNA)
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tRNA collects a specific amino acids present in the cell and brings it to the ribosome
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The anticodon of the tRNA matches up with its counterpart codon on the mRNA
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When the mRNA & the tRNA link up the amino acid detaches and is connected to the adjacent amino acid
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This chain of amino acids is a protein (polypeptide)
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rRNA Ribosome
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rRNA mRNA enters the “A” site of the ribosome
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rRNA When the first codon reaches the “P” site the tRNA brings down the amino acid and links up with the mRNA
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rRNA The “E” site is where the amino acid separates form the tRNA and links up to adjacent amino acids. This is where the MRNA and tRNA leave the ribosome
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ANTICODONS Anticodon Anticodons specify which amino acid a tRNA collects The anticodon then pairs up with its corresponding codon
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ANTICODONS Anticodon So for example... The anticodon AGU would pair with the codon UCA. THEY ARE OPPOSITES OF EACH OTHER
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So What's a codon? Codon This basic unit of genetic code is 3 nucleotides long It specifies a specific amino acid Each codon only specifies 1 amino acid (BUT…an amino acid may have several different codons that code for it)
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THE END http://www.chemistry.emory.edu/faculty/lynn/research/dna/template.gif
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