Of course it’s detrimental. C is worse than A. Is a C prohibitive of a career in medicine? As someone who got a C in orgo 1, I can assure you no.
Interesting choice to blanket target “ivy medical schools.” Princeton doesn’t have one. Cornell is outside the top 10%, and Dartmouth and Brown aren’t in even in the top 25% of medical schools.
In terms of careers? Biotech, pharma, consulting, communications, policy work, NGOs, and writing are also possible with degrees in bio.