Final answer:
Organic compounds, primarily composed of carbon, are essential to life and act as a major energy source. They include carbohydrates, proteins, lipids, and nucleic acids. The statement that organic compounds are the building blocks of life and a major energy source is true.
Step-by-step explanation:
Organic compounds are indeed the building blocks of life and are major sources of energy. This is true because nearly all structures in living organisms are comprised of organic compounds, which are carbon-based molecules typically containing hydrogen and often including other elements such as oxygen and nitrogen. These compounds include proteins, carbohydrates, lipids, and nucleic acids, which play crucial roles in the structure, function, and regulation of the body's tissues and organs.
Carbohydrates are the main source of energy; they include sugars like glucose made by photosynthesis and can be stored as starch. Proteins provide essential amino acids and contribute to many bodily processes. Lipids, which include fats and oils, play various roles including energy storage and cell membrane structure. In contrast, inorganic compounds are usually simpler, do not form cell structures, and often lack carbon and hydrogen in the same structure as organic molecules.