Saltatory conduction and about mycorrhizae

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Reference no: EM133934897

Questions

1. A respiratory system is needed if an organism is too ____ to rely on the diffusion of gases through the body's tissues.

a. small
b. long
c. thick
d. thin
e. round

2. Saltatory conduction:

a. does not involve voltage-activated potassium ion channels.
b. can occur in both myelinated and unmyelinated neurons.
c. is slightly slower than continuous conduction.
d. is more energy efficient than continuous conduction.
e. allows nerve impulses to jump from Schwann cell to Schwann cell.

3. The most closely related animal to vertebrates are the:

a. Hemichordata.
b. Hemichordates.
c. Cephalochordata.
d. Ophiuroidea.
e. Urochordates.

4. Which statement about mycorrhizae is FALSE?

a. They are symbiotic associations between a fungus and a plant root.
b. They increase the uptake of nutrient minerals by the plant.
c. Arbuscular mycorrhizae are extracellular.
d. Endomycorrhizae are intracellular.
e. Members of the Glomeromycota may be involved.

Reference no: EM133934897

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