Final answer:
Autotrophs can synthesize all essential organic compounds for their survival, while humans must obtain some amino acids through their diet.
Step-by-step explanation:
Autotrophs are able to synthesize all essential organic compounds including amino acids, purines, pyrimidines, sugars, vitamins, and fatty acids. Autotrophs, like plants and certain bacteria, produce their own food through photosynthesis or chemosynthesis, using sunlight or chemical energy, respectively. While the human body can synthesize most amino acids, it relies on diet to obtain the nine essential amino acids that it cannot produce on its own.
This synthesis of biomolecules is complex and vital for life, as it contributes to the diverse functions and structures found in organisms.