Final answer:
Carbohydrates are not the main building blocks of tissues and organs; that role is filled by proteins. Carbohydrates are crucial for providing energy as ATP, maintaining connective tissue, and offering structural support in plants, among other functions.
Step-by-step explanation:
The statement that carbohydrates are the main building block of tissues and organs is false. The primary building blocks of tissues and organs are proteins. Carbohydrates are indeed a critical group of macromolecules but serve a different role. They are broken down into glucose, which is then utilized to provide energy as ATP through metabolic pathways. While ATP is crucial for a variety of cellular functions, including the maintenance of connective tissue, it is not a building block for tissues and organs.
Furthermore, carbohydrates, along with proteins, are essential for maintaining connective tissue's integrity and are involved in blood clotting processes. Most notably, carbohydrates are the most common class of biochemical compounds, serving to supply cells with energy, store energy, and compose organic structures like the cell walls of plants. The monosaccharide, often consisting of six carbon atoms, is the basic unit that makes up carbohydrates. In summary, the main functions of carbohydrates include providing energy, structural support, and cell recognition on cell surfaces.