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TLS Online TPP Program

#Question id: 11201

Why are action potentials usually conducted in one direction?

#Unit 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: 3890

#Unit 3. Fundamental Processes

Small signal molecules that regulate transcription are not known to:
TLS Online TPP Program

#Question id: 10768

#Unit 8. Inheritance Biology

Dihybrid test cross genotypic and phenotypic ratio is
TLS Online TPP Program

#Question id: 4036

#Unit 3. Fundamental Processes

Which of the following does not have a DNA-binding domain? 
TLS Online TPP Program

#Question id: 12676

#Unit 10. Ecological Principles

Use the incomplete diagram below, illustrating some of the steps involved in eutrophication to answer the following questions.

What would be a likely entry for box B?

TLS Online TPP Program

#Question id: 19274

#Unit 9. Diversity of Life Forms

Arrange the following in the correct sequence, from earliest to most recent, in which these plant traits originated: 
1. sporophyte dominance, gametophyte independence 
2. sporophyte dominance, gametophyte dependence 
3. gametophyte dominance, sporophyte dependence