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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: 19331

#Unit 12. Applied Biology

Which one of the following sensors converts pressure, tension, force, etc into an electrical signal?
TLS Online TPP Program

#Question id: 548

#Unit 1. Molecules and their Interaction Relevant to Biology

Which one of the following statements is true of enzyme catalysts?
TLS Online TPP Program

#Question id: 3652

#Unit 3. Fundamental Processes

Alkylating agents are electrophilic chemicals which readily add alkyl groups to various positions on nucleic acids. A common example is:
TLS Online TPP Program

#Question id: 11540

#Unit 7. System Physiology – Animal

A cell with membrane-bound proteins that selectively bind a specific hormone is called that hormone's ________.
TLS Online TPP Program

#Question id: 15480

#Unit 12. Applied Biology

Feedback repression involves the turning “off” of enzyme synthesis when the amount of the product has been made in sufficient quantities. The end product of the pathway acts as