اختبار إلكتروني: how organisms obtain energy

Energy production and usage in living organisms occur through two main metabolic pathways: cellular respiration and photosynthesis. Autotrophs, such as plants, act as producers by converting light energy from the sun into chemical energy stored in molecules like glucose. This process requires water and carbon dioxide. In contrast, heterotrophs, such as animals, are consumers that must obtain their organic material from other organisms. Metabolism encompasses these processes, divided into anabolism, which builds larger molecules using energy, and catabolism, which breaks down organic molecules to release energy. The first law of thermodynamics ensures that energy is conserved throughout these biological transformations, often involving the breaking of phosphate bonds in ATP to fuel cellular activities.