If a mutation prevents rhodopsin from properly binding retinal in rod cells, which consequence follows regarding human vision in dim light?

💡 Explanation

If retinal cannot bind rhodopsin, the phototransduction cascade is not initiated. Because this cascade is crucial for dim-light vision via rod cells, scotopic vision will be diminished; therefore, the correct answer is C rather than A, B, or D, which involve other visual processes.

• If a hospital patient's urinary tract infection, initially susceptible to a specific antibiotic, develops resistance after several days, which mechanism most likely explains the rapid adaptation?
• Which failure mode becomes likely when chronic hypertension causes arterial stiffness to diminish baroreceptor sensitivity and impair regulation of aldosterone?
• Why does antibody-dependent cellular cytotoxicity (ADCC) effectiveness against tumors decrease as tumor cell PD-L1 expression increases?
• Which risk increases as bacterial mutation rates rise within a chronic biofilm infection during antibiotic treatment?
• Why does a slowly applied pressure sometimes fail to trigger a touch sensation, even if the same total force, if applied quickly, would be easily detected?
• If a drug has a high volume of distribution and lipophilicity, which consequence follows a standard dose administration?