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TLS Online TPP Program

#Question id: 11195

Action potentials move along axons ________.

#Unit 7. System Physiology – Animal
  1. more slowly in axons of large than in small diameter
  2. by activating the sodium-potassium "pump" at each point along the axonal membrane
  3. more rapidly in myelinated than in unmyelinated axons
  4. by reversing the concentration gradients for sodium and potassium ions
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TLS Online TPP Program

#Question id: 339

#Unit 1. Molecules and their Interaction Relevant to Biology

The edges of each base pair are exposed in the major and minor grooves, creating a pattern of hydrogen-bond donors and acceptors and of hydrophobic groups (allowing for Vander Waals interactions) that identifies the base pair. The edge of an C : G base pair displays the following chemical groups in the following order in the major groove:
TLS Online TPP Program

#Question id: 10475

#Unit 1. Molecules and their Interaction Relevant to Biology

During the formation of a blood plasma protein The aromatic ring of vitamin K undergoes:
TLS Online TPP Program

#Question id: 9177

#Unit 9. Diversity of Life Forms

Which of the following statements regarding turnover in a lake is correct?
TLS Online TPP Program

#Question id: 9261

#Unit 9. Diversity of Life Forms

Which of the following statements about horizontal gene transfer is accurate?
TLS Online TPP Program

#Question id: 11380

#Unit 10. Ecological Principles

Which of the following is/are NOT valid explanation(s) for the observed pattern of species richness?