Influential factors setting the operation point of a bipolar transistor?
There is no one way to bias a BJT.  Generally it is good for some DC feedback to stabilize the bias point so that it varies little for transistor gain over a reasonable range.  A classic example is resistor from collector to base with another resistor from base to ground for NPN.

The bias values are likely adjusted by resistances.  However, to say you change the bias by "changing the resistances" may often be correct but is oversimplifying things to the point of uselessness.