Question

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

Answer 1

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 ****

Will someone please check my answers

Answer 2

I could really use help if they are wrong help me understand this. The first question I am thrown off because everything I have read is worded different so not getting it. Pretty frustrated really

Answer 3

@dream277 What are your "best guesses" and what options do you feel you can get rid of for each question?

Answer 4

I marked the ones I thought were right but the very first one I don't know for sure what to eliminate thank you

Answer 5

Oh, sorry I did not even notice the *s. I think you are good on all be the last two. I believe the one about forensic science is correct, but just for your information, how DNA is used depends on the quality and quantity that is obtained.

Operons? C and D are what I think. I'll explain why and you can chose what you feel is the best. So, although not 100% true it is often taught as if bacteria lack introns. When you have a complex set of metabolic reactions, say breaking down the sugar arabinose, an operon use utilized by many bacteria. It takes several different proteins, and thus several genes to utilize arabinose. An operon is a the cellular equivalent of the assembly line in manufacturing. So the process begins at the beginning of the operon and makes all the things needed in one go.

Now, beside the obvious organization, it will also cause a slight decrease in energy needed to create these proteins if the operon was broken apart.

Most GMOs are plants that have been modified to not be killed by commercial pesticides or herbicides and so massive amounts of these are used.

Answer 6

omg Thank you so much your explanations were awesome too