Which abiotic factor is the primary source of energy for all organisms

Sunlight,sunlight is extremely important due to the fact that plants and animals and pretty much everything on earth needs sunlight,without the sun we wouldn't have water because we need the sun for photosynthesis. 

Pro insulin undergoes extensive posttranslational modification along the production pathway .

No because the eaeht is on a 23.5 degree axis tilt and so when it is winter the northern hemisphere is pointing away from the sun and the soutubern hemisphere is pointing toward the sun