Cellular Respiration Meaning In Biology

Cellular respiration biology definition.

Cellular respiration meaning in biology. The cellular context In the diagram at left 1 represents the cell exterior. In the cells of any non-photosynthetic eukaryote such as a person bread mold or a paramecium glucose and oxygen are going to come from outside the cell. Cellular respiration can be described as the reverse or opposite of photosynthesis.

In this process glucose is broken down in the presence of molecular oxygen into six molecules of carbon dioxide and much of the energy released is preserved by turning ADP and free phosphate into ATP. Organisms that do not depend on oxygen degrade foodstuffs in a process called fermentation. In this process glucose breaks down without the help of oxygen and the by-products produced are alcohol CO2 and energy or ATP.

The respiration occurring at the cellular level wherein the cells produce energy by combining oxygen with food molecules is called cellular respiration. But cellular respiration is slightly more complicated than just converting the energy from glucose into ATP. Cellular respiration is a set of metabolic reactions occurring inside the cells to convert biochemical energy obtained from the food into a chemical compound called adenosine triphosphate ATP.

Cellular respiration Cellular respiration n. Cellular respiration refers to both aerobic and anaerobic respiration but is often synonymous with aerobic respiration. A series of metabolic processes that take place within a cell in which the biochemical energy is harvested from an organic substance eg.

Signal transduction The transmission of signals from a cells outside to its inside. Aerobic respiration requires oxygen to fully oxidise the organic molecule. The principal carbohydrate formed through photosynthesis is glucose.

Cellular respiration is a metabolic pathway that breaks down glucose and produces ATP. Some organisms such as plants can trap the energy in sunlight through photosynthesis see Chapter 5 and store it in the chemical bonds of carbohydrate molecules. To create ATP and other forms of energy to power cellular reactions cells require fuel and an electron acceptor which drives the chemical process of turning energy into a useable form.