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← ScienceWhich consequence results when intense light triggers isomerization in retinal molecules?
A)Signal transduction activating rhodopsin✓
B)Increased GTP hydrolysis commences
C)Cyclic GMP phosphodiesterase shuts down
D)Hyperpolarization impeding calcium influx
💡 Explanation
Isomerization initiates phototransduction; because light causes a change in retinal's molecular geometry, it activates rhodopsin via conformational change. This rather than halting hydrolysis or calcium influx, which occur later because the initial activation kickstarts the cascade.
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