Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 28129
TLS Online TPP Program

#Question id: 1109

What role do phosphatases play in signal transduction pathways?

#Unit 4. Cell Communication and Cell Signaling

  1. They transfer a phosphate group from one protein in the pathway to the next molecule in the series.

  2. They activate protein kinases by phosphorylation.

  3. They amplify the second messenger cAMP.

  4. They inactivate protein kinases to turn off signal transduction.

More Questions
TLS Online TPP Program

#Question id: 16955

#Unit 4. Cell Communication and Cell Signaling

Stage thymocytes express neither CD4 nor CD8, markers associated with mature T cells. They are therefore called double negative (DN) cells. DN cells first travel to the region under the thymic capsule, a region referred to as the ________, where they proliferate and begin to generate their T-cell receptors. Thymocytes that successfully express TCRs begin to express both CD4 and CD8, becoming double positive (DP) cells, and populate the cortex, the site where most (85% or more) immature T cells are found.
TLS Online TPP Program

#Question id: 23580

#Unit 13. Methods in Biology

Which of the following can function as a cloning vector?
TLS Online TPP Program

#Question id: 19464

#Unit 13. Methods in Biology

Which is the common fixative agent that crosslinks amino groups on adjacent molecules
TLS Online TPP Program

#Question id: 671

#Unit 1. Molecules and their Interaction Relevant to Biology

Which was a major scientific accomplishment by Linus Pauling?
TLS Online TPP Program

#Question id: 4723

#Unit 8. Inheritance Biology

The most common cause of the pleiotropic effect of gene is due to