1. Which of the following agents is not a mutagen ?   Ultraviolet radiation   A retrovirus   A transposon or jumping gene   None of the above   Hint Half-n-half Clue   2. The enzyme X removes RNA primers attached by Primase and this gap is then filled in by DNA Polymerase I. The enzyme X is :   RNase H   DNA amylase   DNA ligase   Reverse Transcriptase   Half-n-half Clue   3. 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   4. What does transformation involve in Bacteria ?   the creation of a strand of RNA from DNA   the infection of cells by a phage DNA molecule   assimilation of external DNA into a cell   the creation of a strand of DNA from RNA   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 :   Topoisomerase   Helicase   Gyrase   Ligase   Half-n-half Clue   6. 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   7. 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