Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 28916
TLS Online TPP Program

#Question id: 9578

Bergmann’s rule states that,

#Unit 10. Ecological Principles
  1. Hot Temperatures Limit Many Species’ Distributions
  2. among closely related endothermic (warm-blooded) vertebrates, those living in colder environments tend to have shorter appendages than those living in warmer environments.
  3. among closely related mammals or birds, the largest species occurred at higher latitudes, where it is colder.
  4. the frequency of the cyanide-producing form is less common in colder regions
More Questions
TLS Online TPP Program

#Question id: 11211

#Unit 7. System Physiology – Animal

The following steps refer to various stages in transmission at a chemical synapse.


1. Neurotransmitter binds with receptors associated with the postsynaptic membrane.


2. Calcium ions rush into neuron's cytoplasm.


3. An action potential depolarizes the membrane of the presynaptic axon terminal.


4. The ligand-gated ion channels open.


5. The synaptic vesicles release neurotransmitter into the synaptic cleft.


Which sequence of events is correct?
TLS Online TPP Program

#Question id: 11210

#Unit 7. System Physiology – Animal

An inhibitory postsynaptic potential (IPSP) occurs in a membrane made more permeable to ________.
TLS Online TPP Program

#Question id: 11209

#Unit 7. System Physiology – Animal

Acetylcholine released into the junction between a motor neuron and a skeletal muscle binds to a sodium/potassium channel and opens it. This is an example of ________.
TLS Online TPP Program

#Question id: 11208

#Unit 7. System Physiology – Animal

Neurotransmitters are released from axon terminals via ________.
TLS Online TPP Program

#Question id: 11207

#Unit 7. System Physiology – Animal

In multiple sclerosis, the myelin sheaths around the axons of the brain and spinal cord are damaged and demyelination results. How does this disease manifest at the level of the action potential?

 I) Action potentials move in the opposite direction on the axon.

 II) Action potentials move more slowly along the axon.

 III) No action potentials are transmitted.
TLS Online TPP Program

#Question id: 11206

#Unit 7. System Physiology – Animal

Tetrodotoxin blocks voltage-gated sodium channels, and ouabain blocks sodium-potassium pumps. If you added both tetrodotoxin and ouabain to a solution containing neural tissue, what responses would you expect?