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TLS Online TPP Program

#Question id: 11131

Which statement concerning the generation of an action potential is correct?

#Unit 7. System Physiology – Animal
  1. When the membrane potential in the soma/axon hillock dips below “threshold,” an action potential is initiated
  2. The action potential is initiated in synaptic boutons
  3. The least number of voltage-gated sodium channels in an axon is found near the node of Ranvier
  4. Once an action potential is initiated, it will always run its course to completion
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TLS Online TPP Program

#Question id: 711

#Unit 1. Molecules and their Interaction Relevant to Biology

The shortest alpha helix segment in a protein that will span a membrane bilayer has about.
TLS Online TPP Program

#Question id: 10677

#Unit 10. Ecological Principles

What interactions occur in epiphyte plants that grow on other plants?
TLS Online TPP Program

#Question id: 10403

#Unit 6. System Physiology – Plant

PIFs regulate various aspects of phytochrome-mediated photomorphogenesis, which of the following is incorrect?
TLS Online TPP Program

#Question id: 19108

#Unit 8. Inheritance Biology

Assume that mating is random. Colorblindness is an X-linked recessive trait that is found in about 5 percent of males. What fraction of females are heterozygous carriers of the colorblindness allele?
TLS Online TPP Program

#Question id: 28422

#Unit 5. Developmental Biology

in chick embryo, a thin layer of cells between the area pellucida and the area opaca is called___