THE MOLECULAR BASIS OF INHERITANCE
DNA REPLICATION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
DNA contains sulfur, whereas protein does not.
|
|
|
DNA contains phosphorus, whereas protein does not.
|
|
|
DNA contains nitrogen, whereas protein does not.
|
|
|
DNA contains purines, whereas protein includes pyrimidines.
|
Detailed explanation-1: -Hershey and Chase experimented with radioactively labeled phosphorus and sulphur to determine that DNA and not protein is the genetic material.
Detailed explanation-2: -The protein shell of the virus was tagged with radioactive sulphur, and this ended up in the supernatant. The heavier bacterial cells formed the pellet, so Hershey and Chase knew that DNA was the genetic material of the virus, as the phosphorus was found there.
Detailed explanation-3: -In their experiments, Hershey and Chase showed that when bacteriophages, which are composed of DNA and protein, infect bacteria, their DNA enters the host bacterial cell, but most of their protein does not. Hershey and Chase and subsequent discoveries all served to prove that DNA is the hereditary material.
Detailed explanation-4: -Hershey and Chase used radioactivity to answer the question of whether protein or DNA was the genetic material. They labeled the DNA in a T2 phage with radioactive phosphate, and labeled the protein coat of the T2 phage with radioactive sulfur.
Detailed explanation-5: -In trying to determine whether DNA or protein is the genetic material, Hershey and Chase made use of which of the following facts? Answer: DNA contains phosphorus, whereas protein does not.