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TLS Online TPP Program

#Question id: 11201

Why are action potentials usually conducted in one direction?

#7. System Physiology – Animal
  1. The nodes of Ranvier conduct potentials in one direction.
  2. The brief refractory period prevents reopening of voltage-gated sodium channels.
  3. The axon hillock has a higher membrane potential than the terminals of the axon.
  4. Voltage-gated channels for both Na+ and K+ open in only one direction.
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TLS Online TPP Program

#Question id: 5227

#11. Evolution and Behavior

One of the characteristics of retrotransposons is that
TLS Online TPP Program

#Question id: 5228

#11. Evolution and Behavior

Multigene families are
TLS Online TPP Program

#Question id: 5229

#11. Evolution and Behavior

Two eukaryotic proteins have one domain in common but are otherwise very different. Which of the following processes is most likely to have contributed to this phenomenon?
TLS Online TPP Program

#Question id: 5230

#11. Evolution and Behavior

Homeotic genes
TLS Online TPP Program

#Question id: 5231

#11. Evolution and Behavior

Although quite different in structure, plants and animals share some basic similarities in their development, such as
TLS Online TPP Program

#Question id: 5233

#11. Evolution and Behavior

The most important feature that permits a gene to act as a molecular clock is ________.