which one is good to go for biomedical or microbiology?which is more promising jobwise??

are you talking about undergrad or grad school

Will you be eligible for Medicine if you have biomedical degree- provided MCAT is passed? What will be the nature of job with biomedical degree?

Borama,

Either one. It depends on the nature of research your PI has. Moreover both fields converge at most point besides individual research interest.

Nepali Bhai,

Of course you can. Good luck with that. You can even try with your undergrad in biological sciences as long you score good in MCAT.