Do admissions care about one's minor? If I am a biology major from a lower tier liberal arts school, and I wanted to make myself more attractive for future applications( ie: grad school, job listings), should I bother obtaining a minor in a related field? 

In this case the minor I was attempting was chemistry, but my last semester of undergraduate school is one I want to be "lightish", so I can study for GRE's or hopefully line up internships. 

Ideally, I would hope people see my chemistry minor as me having more laboratory experience than other biology majors, since while obtaining the minor I took mostly chemistry courses with their corresponding laboratories. And that laboratory experience maybe could land me in a laboratory internship of some kind. Or look attractive for potential graduate assistance-ships.
Sure.  How much depends on the field and the department; some places have fairly strict requirements for what you have to have learned in undergrad, and if a minor can hit some of those things, then that works.  

However, in such cases, it tends to be less about the official minor and more about the coursework.  For example, if you're applying to grad school in a mathey field, getting good grades in linear algebra, differential equations, and real analysis will probably be a big help whether there's a math minor on your transcript or not.