The Periodontal Ligament Provides a Hammock of Tissue Bundles That

question 23

Multiple Choice

The periodontal ligament provides a hammock of tissue bundles that support the tooth within the bone. Each of the following is true regarding the periodontal ligament EXCEPT one. Which one is the EXCEPTION?

• A) Periodontal ligament fibers tie the tooth to the bone.
• B) Periodontal ligament fibers prevent the tooth from being pushed into the bone.
• C) The periodontal ligament contains small blood and lymph vessel and nerves.
• D) The main portion of the periodontal ligament is composed of osseous trabeculae.
• E) Fluids within the periodontal ligament act as a hydraulic pressure system on the alveolar walls.

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Definitions:

Mutation Rate

The frequency at which new genetic mutations occur in a given genome over a specified time frame.

Polyphenic Traits

Traits that exhibit several phenotypic expressions depending on environmental or genetic factors.

Phenotypic Plasticity

The skill of an organism to adjust its phenotype in accordance with changes in its surroundings.

Genetic Polymorphism

The existence of two or more distinct alleles at a given locus in a population’s genome.