BILD7Midterm_Key-2010

BILD7Midterm_Key-2010 - MIDTERM EXAM YOUR NAME: Question #...

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MIDTERM EXAM BILD 7, How Life Begins May 6, 2010 150 Points Total YOUR NAME: ANSWER KEY Question # TA: 1-3 Debbie Zhang 4-6 Mary Parsons 7-9 Vishnu Parthasarathy 10-12 Ethan Fram 10 pts . 1. What property of DNA did Chargaff discover? 5 pts. The percentage of bases in DNA that are A = percent of T and the percent of bases that are C = percent of G How did this fact help Watson and Crick figure out the structure of DNA? 5 pts. Chargaff’s rule lead Watson and Crick to consider the possibility that A pairs with T and that C pairs with G in the double helix. 15 pts. 2. What is the genetic code? 8 pts. The genetic code is the rule by which the sequence of different amino acids in a protein is encoded by the sequence of DNA/RNA nucleotides (e.g. triplets of contiguous nucleotides = codons). What is meant by the statement “the genetic code is universal”? 7 pts. The universality of the genetic code refers to the fact that this code is the same in all living organisms on earth (e.g. a given triplet always encodes the same amino acid). 10 pts. 3. Many people believe that Rosalind Franklin was never given proper recognition for her contributions toward solving the structure of DNA. Why do you think they feel this way? Because Watson and Crick used her unpublished X-ray crystallography data on DNA, as well as other measurements, without her approval when they solved the structure of DNA. 10 pts . 4. What happens during “transcription” and where in the cell does it occur? 5 pts. One strand of the sequence of bases pairs in DNA is copied (transcribed) into a single strand of bases in RNA. Transcription takes place in the nucleus of the cell. What happens during “translation” and where in the cell does it occur? 5 pts.
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BILD7Midterm_Key-2010 - MIDTERM EXAM YOUR NAME: Question #...

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