Which term is described as an energy source for cells and is a simple sugar?

• A. Concussion
• B. Hygiene
• C. Glucose
• D. PFD

Answer: (C)

Glucose is the body's main quick source of energy. It is a simple sugar, a monosaccharide, meaning it’s a single sugar unit that can be rapidly broken down to produce ATP, the energy currency cells use for nearly all functions. Through cellular respiration—starting with glycolysis, then the citric acid cycle and electron transport chain—glucose is converted to ATP, providing the energy cells need to perform activities. The brain, in particular, depends on a steady supply of glucose for its energy needs. In plants, glucose is produced by photosynthesis and stored as starch; in animals, it’s stored as glycogen for later use. The other terms don’t describe an energy source or a sugar—they refer to a head injury, cleanliness practices, and a type of safety device, respectively, and thus aren’t relevant to the energy- and sugar-related concept.