How did Alfred Hershey and Martha Chase contribute to our understanding of DNA?

Question

How did Alfred Hershey and Martha Chase contribute to our understanding of DNA? a. Used X-ray diffraction to examine the structure of DNA b. Determined that DNA contains four different nitrogenous bases c. Found that "the transforming principle" is destroyed by enzymes that hydrolyze DNA d. Found that the phosphorus-containing components are the genetic material of phages e. Discovered "the transforming principle" that could genetically alter bacteria With respect to their 3' and 5' ends, the two polynucleotide chains of a double-stranded DNA r a. antiparallel. b. isotopes. c. methylated. d. complementary. e. nitrogenous.

Explanation / Answer

8. The answer is D. Found that the phosphorous-containing components are the genetic material of phages.

Hershey and Chase used p32 and s35 isotopes and found p32 in the phage offspring.

9. The answer is a. antiparallel.

One strand runs from 5'-3' and another runs from 3'-5'. Hence it is called antiparalle.

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