Exam 2: Cell Physiology

The following questions refer to comparative concentrations, permeabilities, and potentials under various circumstances. Match the relationship between the two items, a. and B.., with the qualifications labelled a. through c. (Options may be used more than once or not at all.) a.A is greater than B b.B is greater than A c.A and B are equal -A. concentration of K⁺ in the extracellular fluid B. concentration of K⁺ in the intracellular fluid of a resting nerve cell

Which of the following channel types is sensitive to serotonin?

Amoeboid movement is accomplished by transitions of the cytosol between a gel and a solid state as a result of alternate assembly and disassembly, respectively, of actin filaments.

Endocytosis and exocytosis are both kinds of ____________________ transport.

The primary barrier to passage of water-soluble substances across the plasma membrane is the outer layer of carbohydrates.

Which of the following organelles is NOT covered by a membrane?

What permeability changes would you expect to occur at the postsynaptic neuron when presynaptic neuron Y is stimulated? (Remember that the postsynaptic neuron becomes depolarized by presynaptic neuron Y.)

Which of the following refers to the period of time following an action potential during which a membrane cannot be restimulated no matter how strong the stimulus is?

Most intermediary metabolism is accomplished in the cytosol.

Which of the following is the last step for synaptic signalling when the action potential arrives at the axon terminal of a presynaptic neuron?

Neurotransmitters do not always bind to receptors attached to ion channels.

In secondary active transport, energy is required directly by the carrier to move a substance uphill against a concentration gradient.

At resting membrane potential, no ionic fluxes are taking place across the membrane.

The following questions refer to comparative concentrations, permeabilities, and potentials under various circumstances. Match the relationship between the two items, a. and B.., with the qualifications labelled a. through c. (Options may be used more than once or not at all.) a.A is greater than B b.B is greater than A c.A and B are equal -A. concentration of Na⁺ in the extracellular fluid B. concentration of Na⁺ in the intracellular fluid of a resting nerve cell

What type of junctions are desmosomes, tight, and gap junctions, respectively?

The rising phase of the action potential is due to which of the following conditions?

In the lipid bilayer of the plasma membrane, the hydrophobic tails of the phospholipids orient toward the centre of the membrane, away from water.

Which of the following molecules directly enters the citric acid cycle?

In a graded potential, the direction of current flow is designated by the movement of positive charges.

Which of the following correctly describes graded potentials?