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homework_key - Homework assignment due at the BEGINNING of...

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Homework assignment, due at the BEGINNING of section, 2 September 2008. This is in addition to the usual questions for the reading for discussion section, which will be posted by Monday. Please answer on a blue scantron form. Make sure that your name is on it and that your student ID and “FORM A ” has been filled in. If it’s not, it won’t be graded. This is open-book/open note, but must represent your own work. You should know this stuff for the coming midterm, and if you crib it off of somebody else, you won’t be prepared. If you have been found to be cheating (either giving or taking answers), you’ll get a zero on this. All questions have one best answer. 1. What feature is NOT shared by DNA polymerase III, DNA polymerase II, RNA polymerase, and primase? a) They all use DNA as a template b) The all extend in a 5’ to 3’ direction c) They are all powered by the hydrolysis of phosphoanhydride bonds in NTPs d) They are all capable of starting without an existing 3’ –OH—ONLY RNA polymerases can do this e) They all are enzymes that couple reactions with G greater than zero to reactions with a G that is much, much less than zero 2. What feature of nucleic acids makes them better vehicles for inheritance than proteins? a) phosphodiester bonds are more easily broken and formed than peptide bonds b) nitrogenous bases are complementary, while amino acid R-groups are not c) nucleic acids can form antiparallel structures, while amino acids cannot d) ribonucleic acids are capable of catalysis, while polypeptides are not e) there are only four nucleotides, but there are 20 amino acids 3. What feature of proteins makes them better enzymes than nucleic acids? a) amino acids have a wider variety of functional groups than nitrogenous bases b) the peptide bond allows greater flexibility than the phosphodiester bond c) amino acids can have interesting secondary and tertiary structures, while nucleic acids cannot d) proteins can catalyze reactions, while nucleic acids are incapable of catalysis e) proteins can bind to substrates, while nucleic acids cannot 4. What feature of ribonucleic acids makes it possible that they, and not proteins were the first step towards life on earth? a) they have catalytic activity b) they have can form complementary base-pairs c) they can bind to amino acids d) their catalytic activity depends upon sequence, which can be mutated and then selected e) all of the above
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5. Knowledge of an organism’s genome—its total DNA sequence—tells you (choose the
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