Question

Which of the following is an energy-rich compound formed in cellular respiration?
A. ADP
B. Glucose
C. Water
D. ATP
E. Oxygen

Answer 1

Cellular respiration is the process in which the energy-rich molecule ATP is formed with the help of Glucose and oxygen. ATP stands for adenosine triphosphate is an organic compound that provides energy to carry out several metabolic actions.

Complete answer: Cellular respiration is a set of several metabolic reactions. It is a catabolic process where the breakdown of glucose takes place with the help of oxygen and Carbon dioxide and water are released. The energy-rich compound formed during this reaction is ATP. Hydrolysis of ATP to ADP (i.e. adenosine diphosphate and inorganic phosphate) is taking place which is used to carry out cellular work.
Overall reaction: $Glucose + oxygen \to ATP + water + carbon\,dioxide$ .
All the reactions of cellular respiration are grouped into three stages-
Glycolysis
The Krebs cycle is known as the citric acid cycle because its first stable compound is citric acid.
ETS i.e. electron transport system.
Glycolysis- The set of reactions in which glucose is converted into pyruvate. It is a ten-step pathway that occurs in the cytoplasm of a cell.
The Krebs cycle also called the citric acid cycle- Pyvurate further enters mitochondria. It is an eight-step pathway that forms NADH, FADH molecule. These molecules are further transported to mitochondria for performing ETS.
ETS (Electron transport chain)- NADH, FADH act as electron donors. These electrons pass through membrane-associated protein complexes and result in the formation of ATP.
So, the correct answer to the given question is option D. ATP.

Note: Anaerobic organisms carry the process of fermentation. Kreb cycle is sometimes also referred to as the TCA cycle (tricarboxylic acid cycle).