INFO units are computer science units. As it stands there aren't any 1000 level COMP units anyway, so your choice is pretty easy.
If you want to major in Computer Science and Physiology then the units you would want to enrol in would be as follows:
Semester 1 - MATH1001, MATH1002, BIOL1003, CHEM1101, INFO1103
Semester 2 - MATH1003, MATH1005, CHEM1102, MBLG1001, INFO1105
Of course you can exchange any of the units above for the equivalent advanced course if you wish.