1. An enzyme (used by all retroviruses) that transcribes genetic information of the virus from RNA into DNA, is :   Reverse transcriptase   RNA polymerase   Restriction nuclease   Methylase   Hint Half-n-half Clue   2. 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   3. 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 :   Topoisomerase   Helicase   DNA Polymerase II   Primase   Half-n-half Clue   4. What does transformation involve in Bacteria ?   the creation of a strand of DNA from RNA   the creation of a strand of RNA from DNA   assimilation of external DNA into a cell   the infection of cells by a phage DNA molecule   Half-n-half Clue   5. Because DNA polymerase III can only act from 5' to 3', continuous strand growth can be achieved only along one of the template strands (Leading strand) and strand growth along the other strand must occur discontinuously resulting in the production of a series of short sections of new DNA called :   Replicon fragments   Okazaki fragments   Klenow fragments   None of the above   Half-n-half Clue   6. DNA Polymerase III is actually an aggregate of several different protein subunits. So it is often called a :   Holoenzyme   Primeosome   replisome   None of the above   Half-n-half Clue   7. 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