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simple control a dc motor via arduino uno ?

hi sirs, this is my first topic in this forums ..
i want to control a 12v and a 5v dc motor with 2 terminals only .. not steppers .. and i have not a drive motor shield or its IC. i want not to control their speeds but enable and disable them by my arduino and i fear of high current that can reverse on arduino borad even from a simple 1.5 volt motor so i prefers safety first :D ..
all i have - my arduino uno & these 2 dc motors and 2 tansistors S15D40 & bld135d
that in my hand at time :) so can i use them instead of mosfet trans. ? and keep the arduino safe .. knowing that
my pwer source is 12/5 v with 2A
AND SORRY FOR MY BAD ENGLISH :D
 
but i wonder why this diode must connected parallel not series with the motor or the inductive ?
 

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