Hi - I want to do a year out before doing a biology PhD to make sure its what I want. Will certain jobs during this time increase my chances of getting a PhD and more importantly, are there things which will decrease my chances?

I don't think anything will neccessarily decrease your chances, but there are certain things you can do to increase your chances. You want to do biology so working in a lab or getting some field work experience would look good on your CV.

i want to stuty P.hD.,in biochemistry.
which institute is best
i want guide details
institute name
feild specxialisation.
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WARNING!
I am just finishing a gap year and I have worked outside science . I have found it a definite disadvantage when trying to get a phd.