Alright, so we are told that a normal human liver cell will divide 60 times and then stops. Even freezing the cell for months or even years will not "trick" the cell; it will "remember" where it stopped dividing.
So, we are asked which of the following answer choices CANNOT be true.
Answer choice (B) is the only answer that must be false, i.e. cannot be true. We know that a normal liver cell will only divide 60 times. So, if it has divided more than 60 times, then it cannot be a normal liver cell. We also know that freezing will not change this normal behavior. Thus, answer choice (B) cannot be true.
Hope that helps! Please let us know if you have any other questions.
YangDecember 19, 2015
Still confused! Answer B didn't say anything about divide more than 60 times, still lost with your answer choice. Please help!
AlexJanuary 24, 2017
@Yang Part of the question stem asks, "If the information above is accurate, a liver cell in which more than 60 divisions took place in a tissue culture CANNOT be which of the following?" We know that normally a human liver cell will stop at 60 divisions. So B has to be the answer.
