History Of Dna Essay

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History of DNA 1. Explain the experiment done by Hershey and Chase. What did they discover? They radioactively labeled bateriophages to determine what part of the virus entered the bacterium – DNA or the protein coat. The viral DNA was labeled with radioactive 32P (phosphorus) and the viral protein was labeled with radioactive 35S (sulfur). The experiments showed that the 32P entered the cells whereas the 35S did not. They concluded that DNA, not protein, is the genetic material. 2. Who were Watson and Crick and what were their findings? What did they call DNA? James Watson and Francis Crick were given credit for determining the 3D shape of DNA. They called DNA the double helix and won the Nobel Prize in Medicine in 1962.…show more content…
Study Fig 24.6 (p. 491) Open your book and look at the picture. Now. Translation 1. What is the purpose of translation and where does it take place? Translation is when the mRNA is translated into a sequence of amino acids (protein). It takes place on the ribosome, in the cytoplasm. 2. What is the three letter base sequence called on mRNA? codon 3. What is the three letter base sequence on tRNA called? anticodon 4. What amino acid do proteins start with? (start codon) methionine 5. What are stop codons? One of three codons that do not code for an amino acid 6. Outline the main steps of translation. a. A small ribosomal subunit binds to mRNA with the codon AUG. A tRNA with the anticodon UAC binds to the AUG codon. b. A second tRNA docks at the ribosome and peptide bonds form between the amino acids. c. The ribosome moves on down the mRNA, making room for the next incoming tRNA and amino acid. When it reaches a stop codon, it stops production of the protein. Universal Genetic Code 1. Is it the codon or the anticodon that codes for the amino acid? codon 2. Amino acids are the monomers of what macromolecule? protein 3. Be able to use the codon chart (aka “Universal Genetic

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