Question 8 Which of the following best describes the process of aerobic respirat

Question

Question 8 Which of the following best describes the process of aerobic respiration? Oxygen is exchanged with CO2 and it is used to remove the waste products of cellular respiration. Glucose is reduced gaining electrons from oxygen and from ATP The electrons from glucose are donated to ADP transforming it into ATP which the cell uses for energy O Glucose is oxidized, its electrons are used to create a proton gradient which then is used to make ATP O Krebs cycle produces the large bulk of the ATP during aerobic respiration using substrate-level phosphorylation. Previous

Explanation / Answer

Cellular respiration requires sugars, which is obtained through food, in addition to oxygen, which we get from breathing.These materials are transported to every cell in body through blood vessels. During cellular respiration, cells use oxygen and glucose to release energy. Carbon dioxide is a waste product of the process.Hence Carbon dioxide must be removed from cells. First one is anaerobic

2. Glucose is reduced gaining electrons from oxygen and form ATP

The first stage of cellular respiration is glycolysis, where enzymes splits a molecule of glucose to form pyruvate . Energy is needed at the start of glycolysis to split the glucose molecule into two pyruvate molecules. Scientists believe glycolysis evolved before the other stages of cellular respiration.This is because the other stages need oxygen, whereas glycolysis does not, and there was no oxygen in Earth’s atmosphere when life first evolved about 3.5 to 4 billion years ago. Hence this is anaerobic respiration.

3. The electrons from glucose are donated to ADP transforming it into ATP, which the cell uses for energy

Each carbon atom loses electrons when it is oxidized in the presence of oxygen and oxygen becomes reduced, because it gains electrons. During cellular respiration, redox reactions basically transfer this bond energy in the form of electrons from glucose to molecules called electron carriers. So an electron carrier that transports electrons during cellular respiration and by using electron carriers, energy harvested from glucose can be temporarily stored until the cell can convert the energy into ATP. This is anaerobic.

4, Glucose is oxidized, its electrons are used to create a proton gradient which then is used to make ATP.

The correct answer is that glucose is oxidized, and then its electrons are taken to the electron transport chain where a proton gradient is created and then the "turbine" will create ATP as the H+ is moved down the concentration gradient. This process is aerobic.

5. Krebs cycle produces the large bulk of the ATP during aerobic respiration using substrate level phosphorylation

Most ATP is generated by oxidative phosphorylation in aerobic or anaerobic respiration while substrate-level phosphorylation provides a quicker, less efficient source of ATP, independent of external electron acceptors. This is the case in human erythrocytes, which have no mitochondria, and in oxygen-depleted muscle. Hence this is anaerobic.

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