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TLS Online TPP Program

#Question id: 1814

In Sir Peter Medawar's classic experiments demonstrating the development of immunological tolerance:

#Unit 4. Cell Communication and Cell Signaling

  1. Thymectomized mice had to be used

  2. Severe combined immunodeficient (SCID) mice were used

  3. The mice were chimeric

  4. Skin grafts were always rejected

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TLS Online TPP Program

#Question id: 4031

#Unit 3. Fundamental Processes

An experiment was designed to obtain nonspecific transcription from both strands of a DNA molecule. Which of the following strategies would be most effective in achieving this?
TLS Online TPP Program

#Question id: 3299

#Unit 11. Evolution and Behavior

There are four alleles, A1, A2, A3 and A4 in equal abundance in frequency. Hardy-Weinberg equilibrium frequencies of the total heterozygote would be
TLS Online TPP Program

#Question id: 354

#Unit 1. Molecules and their Interaction Relevant to Biology

You have a freshly prepared 0.1 M sucrose (molecular mass 342) solution, which means ________.
TLS Online TPP Program

#Question id: 10572

#Unit 10. Ecological Principles

In 2005, the United States had a population of approximately 295,000,000 people. If the birth rate was 13 births for every 1,000 people, approximately how many births occurred in the United States in 2005?
TLS Online TPP Program

#Question id: 17820

#Unit 13. Methods in Biology

During the RNA extraction guanidinium thiocyanate functions as a strong inhibitor of