It depends on how you define entropy, but in practical terms (like those relevant in a biologic system), I'd say it can be reversed.
When I think about entropy, I think about in context of an untidy room. Of course it tends toward disorganization over time and the rate at which it tends toward untidiness is determined by the nature of the person living in it. But with input of energy (i.e., cleaning), it is possible to reverse the trend and turn an untidy room into a clean one.
Same with cells and living organisms: the trend toward disordered and high entropy states is energetically favorable - and cells and living organisms spend a great deal of energy countering this trend.