1. In 1940, Nobel Laureate Barbara McClintock discovered sequences of DNA that can move around to different positions within the genome of a single cell and cause mutations. These sequences (first observed in maize) are called :   Transposons   inverted repeats   direct repeats   sticky ends   Hint Half-n-half Clue   2. The enzyme that stitches Okazaki fragments together (along the lagging strand) is called :   Topoisomerase   DNA Ligase   Holoenzyme   DNA Polymerase II   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. 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   5. The enzyme responsible for initiating the unwinding of double-stranded DNA (eliminating supercoiling) by nicking a single strand of the DNA molecule is :   Gyrase   Helicase   Topoisomerase   Ligase   Half-n-half Clue   6. What does transformation involve in Bacteria ?   the infection of cells by a phage DNA molecule   assimilation of external DNA into a cell   the creation of a strand of RNA from DNA   the creation of a strand of DNA from RNA   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