Question

The elemental makeup of proteins and DNA aided Alfred Hershey and Martha Chase in designing an experiment to determine which composes genetic material. What was particularly helpful to Hershey and Chase’s experiment?
A-Bacteriophages contain radioactive sulfur and phosphorous.
B-Protein has sulfur and very little phosphorous.DNA has phosphorous and no sulfur.
C-DNA has sulfur and very little phosphorous.Protein has phosphorous and no sulfur.
D-All of the above are correct.

Answer 1

I think D

Answer 2

i think A

Answer 3

@alyssa.ward2016 It is definitely not D. @Ahmedsamier Bacteriophages are just viruses that infect bacteria. Why would they have radioactive elements?

I am not sure how I can help without just giving the answer at this point. It is "B". DNA has zero sulfur and lots of phosphorous, and proteins have lots of sulfur.

Answer 4

bacteriophages in this exp, were labeled with radioactive sufur in protien and phosphorus in DNA which helped them to know the real genetic material

Answer 5

@Ahmedsamier Yes, but that doesn't aid them at all. If it were not for the nature of the chemical structures of DNA and proteins it wouldn't matter.

Answer 6

yup but without this lapeling they ain't identify it briefly u gotta me !

Answer 7

@Ahmedsamier It wouldn't matter at all if the nature of DNA and proteins were not what it is. They could have used all the labelled bacteriophages they wanted and they still would not have been able to figure anything out if it was not for the lack of S in DNA and the abundance of it in proteins.

Also, can you tell me how "A" make sense when the question states quite clearly that it is discussing the make-up of DNA and proteins, "The elemental makeup of proteins and DNA aided..."?

Answer 8

u right boss
i read it wrongly about makeup of genetic material :D
sorry boss

Answer 9

Both of you were wrong it was C

Answer 10

@alyssa.ward2016 Then go complain. DNA has zero sulfur in it. Check it out here:

http://en.wikipedia.org/wiki/DNA#mediaviewer/File:DNA_Structure%2BKey%2BLabelled.pn_NoBB.png

There is no way that C should have been correct.

Answer 11

@alyssa.ward2016 Here is a direct quote from the paper:

"Whether sulfur-free material other than DNA enters the cell has not been determined."

http://jgp.rupress.org/content/36/1/39.full.pdf