Juan and Karletta Were Walking One Night When They Heard

question 174

Multiple Choice

Juan and Karletta were walking one night when they heard a car backfire. Juan was convinced the sound came from directly in front of them, and Karletta was convinced the sound came from directly behind them. Which of the following would explain their difficulty localizing the sound?

• A)Sound localization is more difficult in the dark.
• B)Only speech sounds can be accurately localized.
• C)The sound waves arrived at both left and right ears at the same instant.
• D)We are able to judge distance better than direction for sounds.

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Definitions:

G-protein

A type of protein that acts as a molecular switch inside cells, involved in transmitting signals from a variety of stimuli outside a cell to its interior.

Membrane-bound Receptor Model

A conceptual model describing receptors located on the cell membrane that interact with external signals (ligands) to initiate cellular responses.

Membrane-bound Receptor

A type of receptor that is attached to the cell membrane and is involved in signaling pathways following the binding of a ligand.

Cyclic AMP

A second messenger molecule important in many biological processes, such as signal transduction and intracellular communication.