2. Depends on type. For B737 is 2.5/-1.0g in clean configuration and 2.0/0.0g when "dirty".
Same values are true for the 747.
Note that these are the 'normal' loads where it's certified that nothing adverse will happen. Exceeding those limits will require an inspection and may result in damage or permanent deformation (e.g. you can bend the airplane). However the "limit" loads beyond which the airframe may structurally fail are quite a bit higher (by regulation, at least 50% higher).