using pics to power IC

say i a have a 74Ls AND gate off my head pin 14 is Vcc and pin 7 is ground, so can I hook Vcc of the IC to a port on the uC to turn it on and off>???

and if so, can i hook the IC ground pin 7 to the uC port, then turn the port off, could I do this to use the port as a ground for the ic?

You can power ICs from microcontroller outputs. You do have make sure that the microcontroller output can provide enough power, with a good safety margin to make sure that the voltage is very close to 0 V or 5 V depending on whether you switch the negative or positive.

It is also a very good idea to have generous suppressor capacitors.

yes i was thinking that,, but i can use a port pin in its off states as Vss though right?

You can provide Vss to an IC when the port pin is driven low. That is of course different from making the output high impedance. I'm not sure what you mean by "off state".