Which of the following is not part of the carbon cycle?
a.) respiration
b.) decomposition
c.) consumption
d.) fermentation

Carbon cycle is  process that shows the exchnge of carbon in the living and atmospheric system. Carbon cycle starts with the giving off of carbon dioxide from nimals, accumulation of co2 of plants, contribution of organic matter of dead animals and plants, photosynthesis, etc. The answer is D. fermentation

Pro insulin undergoes extensive posttranslational modification along the production pathway .