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TLS Online TPP Program

#Question id: 11204

Why do Na+ ions enter the cell when voltage-gated Na+ channels are opened in neurons?

#Unit 7. System Physiology – Animal

  1. because the Na+ concentration is much lower outside the cell than it is inside

  2. because the Na+ ions are actively transported by the sodium-potassium pump into the cell

  3. because the Na+ concentration is much higher outside the cell than it is inside, and the Na+ ions are attracted to the negatively charged interior

  4. because the Na+ concentration is much higher outside the cell than it is inside, and the Na+ ions are actively transported by the sodium-potassium pump into the cell

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TLS Online TPP Program

#Question id: 4759

#Unit 8. Inheritance Biology

which of the following is not a mechanism for sex determination?
TLS Online TPP Program

#Question id: 10707

#Unit 10. Ecological Principles

Based on the intermediate disturbance hypothesis, a community’s species diversity is increased by
TLS Online TPP Program

#Question id: 10956

#Unit 7. System Physiology – Animal

The coagulation pathway that begins with tissue thromboplastin is
TLS Online TPP Program

#Question id: 19471

#Unit 12. Applied Biology

The gene gox has been expressed in plants in combination with which other bacterium gene
TLS Online TPP Program

#Question id: 676

#Unit 1. Molecules and their Interaction Relevant to Biology

What would you expect about the formation of an α-helix for a segment of a protein chain that contains lysine approximately every fourth residue with all other residues being mostly hydrophobic?