What is the difference between a totipotent stem cell and a pluripotent stem cell? What piece of evidence would you
need to distinguish them? What will be an ideal response?
A totipotent stem cell has the potential to develop into an entire organism. A pluripotent cell
has the potential to develop into any cell of the body. To determine whether a cell is
totipotent, experiments must show that the cell is able to direct the development of an entire
organism.
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Why is Taq polymerase required to perform a polymerase chain reaction (PCR)?
A. Taq polymerase is heat stable and can therefore withstand the high temperature steps required of PCR that most other enzymes cannot tolerate. B. Taq polymerase is more efficient than other polymerases. C. Taq polymerase is pressure stable and can therefore withstand the high pressure steps required of PCR that most other enzymes cannot tolerate. D. Taq polymerase makes fewer errors than other polymerases. E. All of the choices are correct.
The buildup of a toxin in an organism’s body is called biological magnification
____________________ Indicate whether the statement is true or false.
Improving the balance between abdominal and back muscles is a primary means of preventing back pain.
a. true b. false
Short hair (L) is dominant to long hair (l). If a short-haired animal of unknown origin is crossed with a long-haired animal and they produce one long-haired and one short-haired offspring, the results would indicate that