If the G Proteins in Photoreceptors Are Pharmacologically Blocked, Exposure

question 206

Multiple Choice

If the G proteins in photoreceptors are pharmacologically blocked, exposure of these photoreceptors to light will

• A) raise the intracellular concentration of cations.
• B) lower the intracellular concentration of cations.
• C) cause electroreceptors to open ion channels.
• D) cause a signaling cascade.
• E) have no effect on these receptors.

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