Answer Happy

You perform an experiment to look at DNA replication in a cell.
After allowing DNA replication to proceed for 20 minutes, you
examine the DNA and determine that the newly synthesized molecules
are composed of a longer, parental strand attached to multiple,
shorter newly synthesized strands. Which of the following enzymes
were missing from the mixture?
a) primase
b) topoisomerase
c) DNA ligase
d) DNA polymerase I
e) all of the above
The lac operon is considered an inducible operon because it is
switched on in the presence of lactose. The genes contained in the
lac operon encode for enzymes that are needed for lactose
breakdown. What would happen to the lactose levels if you added
lactose to bacteria containing a mutated repressor that is unable
to bind the inducer so that it remains active?
a) lactose levels would decrease
b) lactose levels would increase
c) lactose levels would remain unchanged
d) none of the above
In order for transcription to occur the DNA has to be accessible
to transcription factors and RNA polymerase. Which of the following
chromosome conformations are open and easily accessed for
transcription?
a) heterochromatin
b) euchromatin
c) nucleosome
d) none of the above
Despite the fact that the cells in the various tissues and
organs in our body contain the same genomic material, they are
different from each other and are able to perform specialized
functions. These cells are different because:
a) we inherited some cells from each parent.
b) each cell contains different genes.
c) each cell expresses different genes.
d) each cell uses its own unique genetic code.
e) all of the above.