Cellular respiration works either within the presence or absence of oxygen. The process is called cellular respiration because the cell seems to respire in a way that it takes in molecular oxygen and release carbon dioxide.
The correct sentences are as follows-
- The second part of respiration requires oxygen to function. The pyruvate molecules from glycolysis enter the matrix of a mitochondrion where the second stage of cellular respiration takes place, called Kreb's cycle.
- During the second part of cellular respiration, the molecules are broken down further and produce carbon dioxide as a waste product. Oxygen and glucose are both reactants, main product is ATP, waste products include CO2 and water.
- The second part of cellular respiration takes place in the cytoplasm. The second stage of cellular respiration, Kreb's cycle takes place in the matrix.
- Cellular respiration begins in the mitochondria, where glucose is broken down into smaller molecules to produce energy. Glycolysis converts each molecule of glucose into two smaller molecules of pyruvate.
Thus, all plants and animals use the process of cellular respiration to obtain energy from food done by the second stage.
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