1. The enzyme that accomplishes the unwinding of the original double stranded DNA molecule, once supercoiling has been eliminated, by breaking the hydrogen bonds that hold the two strands together is :   DNA Polymerase II   Topoisomerase   Helicase   Primase   Hint Half-n-half Clue   2. The enzyme that (during replication) proceeds along one of the strands of a DNA molecule adding deoxy-nucleotide-triphosphates to hydrogen bond with their appropriate complementary dNTP on the other single strand and to form a covalent phosphodiester bond with the previous nucleotide of the same strand is called :   DNA Polymerase II   DNA Polymerase I   Primase   DNA Polymerase III   Half-n-half Clue   3. An enzyme that recognizes and cuts DNA only at a particular sequence of nucleotides is often called :   Restriction endonuclease   RNA polymerase   Photolyase   DNA glycosylase   Half-n-half Clue   4. What does transformation involve in Bacteria ?   assimilation of external DNA into a cell   the infection of cells by a phage DNA molecule   the creation of a strand of RNA from DNA   the creation of a strand of DNA from RNA   Half-n-half Clue   5. The enzyme that stitches Okazaki fragments together (along the lagging strand) is called :   DNA Ligase   Holoenzyme   Topoisomerase   DNA Polymerase II   Half-n-half Clue   6. A mamalian cell typically has 1.2 meters (when completely outstretched) of double stranded DNA.The total time to duplicate the DNA is 5 hours. How many origins of replication are there if the rate of duplication is 16µmeters/min ?   250   15000   1   500   Half-n-half Clue   7. The enzyme that replaces the nucleotides of the RNA primer with the appropriate DNA nucleotides is :   DNA Polymerase II   RNA Polymerase   DNA Ligase   DNA Gyrase   Half-n-half Clue