1. In DNA, mutations at G-C sequences occur quite frequently since 5-methyl cytosine easily deaminates to form :   Thymine   Adenine   Guanine   Cytosine   Hint Half-n-half Clue   2. The enzyme that creates a short RNA oligonucleotide at initiation sites where replication is to be carried out is called :   Primase   DNA Ligase   DNA Gyrase   Exonuclease   Half-n-half Clue   3. 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   4. 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   Half-n-half Clue   5. The enzyme that stitches Okazaki fragments together (along the lagging strand) is called :   DNA Polymerase II   DNA Ligase   Topoisomerase   Holoenzyme   Half-n-half Clue   6. Which of the following agents is not a mutagen ?   Ultraviolet radiation   A retrovirus   A transposon or jumping gene   None of the above   Half-n-half Clue   7. The enzyme responsible for initiating the unwinding of double-stranded DNA (eliminating supercoiling) by nicking a single strand of the DNA molecule is :   Ligase   Gyrase   Helicase   Topoisomerase   Half-n-half Clue