Fluid Builds Up in the Middle Ear of Children Born

question 44

Multiple Choice

Fluid builds up in the middle ear of children born with cleft palates. This condition

• A) does not affect hearing-fluid conducts sound.
• B) distorts hearing because it makes the ossicles move more freely.
• C) dampens auditory sensations because it restricts movement of the tympanic membrane.
• D) irreparably damages the cochlea, so these children will need cochlear implants.

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Definitions:

Allosteric Site

A region on an enzyme that binds to molecules in the cell, resulting in a change in the enzyme's activity; not the active site where substrate molecules bind.

Tryptophan Operon

A segment of DNA in bacteria that regulates the production of tryptophan by switching the genes responsible for its synthesis on or off.

Active Repressor Protein

A protein that binds to specific DNA sequences to inhibit the transcription of certain genes, controlling gene expression.

Inactive RNA Polymerase

An RNA polymerase enzyme in a resting state that is not involved in the transcription of DNA into RNA.