biology check answers please

The Hershey-Chase experiment proved that DNA was the hereditary material because.
a) radioactive phosphorus in viral proteins was shown not to enter bacterial cells
b) radioactive phosphorus in viral DNA was shown to enter bacterial cells **** (my choice)
c) radioactive sulfur in viral proteins was shown to enter bacterial cells
d) radioactive sulfur in viral DNA was shown not to enter bacterial cells

How does replication of the lagging strand of DNA compare with replication of the leading strand?
a) the replication process is identical for both strands
b) Okazaki fragments are made on the lagging strand but not on the leading strand **** (my choice)
c) the leading strand and lagging strand are copied in the same direction
d) DNA ligase works on the leading strand while DNA polymerase works on the lagging strand

How can scientist use DNA in crime scene investigations?
a) they analyze the size of the DNA to determine where a crime was committed
b) They analyze the GC content of the DNA to determine how a crime was committed
c) They analyze the sequence of bases in the DNA to determine who committed the crime *****
d)They analyze the age of the DNA to determine when a crime was committed

Operons allow prokaryotes to
a)replicate DNA at the appropriate time
b) avoid mutations
c) keep their DNA organized
d) conserve energy **** (torn between this one and a)

Which of the following is a concern about the use of genetically modified plants in growing food?
a) Genetically modified plants may require more pesticides
b) Genetically modified plants may not break down normally and cause recycling problems
c) Genetically modified plants may be more susceptible to disease
d) Genetically modified plants may harm organisms that were never intended to be harmed ****

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