Lesson Quiz - Cellular Respiration

A molecule of glucose contains 6 carbon atoms.

The electron transport chain is the final step in cellular respiration, where electrons are passed along a series of protein complexes to generate ATP. This process is highly efficient and produces the majority of ATP molecules in cellular respiration. The other steps, such as glycolysis and the Krebs cycle, also produce ATP but in smaller quantities compared to the electron transport chain. Therefore, it is correct to say that the electron transport chain produces the most ATP out of all the steps in cellular respiration.

Cellular respiration is the process by which cells convert glucose molecules into ATP (adenosine triphosphate), which is the main energy currency of cells. ATP is a high-energy molecule that can be easily used by cells to perform various functions such as muscle contraction, active transport, and synthesis of molecules. Therefore, the correct answer is ATP, as it accurately reflects the purpose of cellular respiration in converting glucose energy into ATP energy.

Glycolysis is the first step in cellular respiration, where glucose is broken down to produce energy. During glycolysis, one molecule of glucose is converted into two molecules of pyruvate. This process occurs in the cytoplasm of the cell and does not require oxygen. Pyruvate is then further metabolized in the presence of oxygen to produce more energy through the citric acid cycle and oxidative phosphorylation. Therefore, the correct answer is pyruvate.

In cellular respiration, oxygen acts as the "final electron acceptor". During the electron transport chain, electrons are passed from molecule to molecule, and oxygen is the final molecule to accept these electrons. This process is crucial because it allows for the production of ATP, the energy currency of the cell. Without oxygen as the final electron acceptor, the electron transport chain would not be able to function properly, leading to a decrease in ATP production and ultimately affecting the overall energy balance of the cell.

Cellular respiration is the process by which cells convert glucose and oxygen into ATP, the energy currency of the cell. Glucose is the main source of energy for cellular respiration, while oxygen is required as the final electron acceptor in the electron transport chain. Carbon dioxide is a byproduct of cellular respiration, not a requirement for the process. Water is also not necessary for cellular respiration, although it may be produced as a byproduct. Therefore, the necessary components for cellular respiration to occur are glucose and oxygen.

The Krebs cycle is a series of chemical reactions that occur in the mitochondria of cells. It is responsible for producing energy in the form of ATP through a process called oxidative phosphorylation. During the Krebs cycle, carbon dioxide is created as a byproduct. Additionally, the cycle also loads electrons onto electron carrier molecules, such as NADH and FADH2, which are then used in the electron transport chain to generate ATP. Therefore, the statements "creates carbon dioxide," "happens inside mitochondria of cells," and "loads electrons onto electron carrier molecules" are all true of the Krebs cycle.