As a scientist, you seek to prove that DNA is the hereditary macromolecule by replicating the Hershey-Chase experiment. You cult
ure the lambda phage in heavy and light Cl (Cl-36 is heavy and radioactive - the most abundant is Cl-35, lighter and non-radioactive). You purify the phage from their growth media and infect the E. coli, where will you detect radioactivity? Select one:
a. Within the E. coli pellet as the DNA has entered the bacterial cells.
b. On the E. coli cell surface (or phage fraction), as part of the phage protein coat.
c. In the supernatent (free liquid) of your test tube
d. Both A and B
e. None of the above
Why is the answer none of the above? Why cant the radioactivity be detected?
The correct answer is option e. "None of the above".
Explanation:
The Hershey-Chase experiment helped to prove that DNA was the genetic material, by specifically labeling the DNA material of a bacteriophage with phosphorus-32. In this experiment the lambda phage is labeled with heavy and light Cl. CI-36, the one that is heavy and radioactive, corresponds to Chlorine-36. Chlorine is not an element found in DNA such as phosphorus, therefore lambda DNA will not be labeled and no radioactivity will be detected.
The answer is Iron, this is the important mineral that she
needs to obtain as this will help her in her ways to cardiovascular fitness as
this mineral helps the hemoglobin to build in her body and for her t be able to
get enough nutrients.
Water typically cannot get as cold as ice does. Since water is warmer, the ice breaks down. that's why it makes your drinks colder and then the ice later melts.
Im sorry, but that is a question for you to answer. It is asking for you to take your experience from that lab, and see what you would do different to make the lab better and why you would do that. So all you have to do is write/type what you would do to make that lab experience better, and why you would do that.