The term cellular respiration refers to the pathway by which cells release energy, from
chemical bonds of food molecules that enter them. It provides that energy for the
ential processes of life. So living cells must carry out cellular respiration. It can be in
presence of oxygen that is ‘aerobic respiration. The process of bacterial respiration by
erobic method is called fermentation. The substancess become soar because of ethy or *
ic acid Is produced. In Animals the anaerobic respiration leads to formation of lactic *
from glucose. In anaerobic repiration few ATP molecules are produced. Cellular
iration in prokaryotic cells like that of bacteria occurs within the cytoplasm. In
ryotic cells cytoplasm and mitochondria are the sites of the reactions. The produced
gy is stored in mitochondria in the form of ATP. That is why mitochondria are called
ver houses of the cell”.
he exact chemical details of the breakdown of sugar or other foods within a living cell
not take place as a single reaction, but occurs in a series of small steps.
ow does this affect the energy release? As the change in the chemical nature of the
ule from one stage to the next is slight, in any step small amount of energy is released.
mplete breakdown of a sugar molecule with the release of all its available energy
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CAN ANYONE EXPLAIN THIS
Answers
As we have just seen, cells require a constant supply of energy to generate and maintain the biological order that keeps them alive. This energy is derived from the chemical bond energy in food molecules, which thereby serve as fuel for cells.
Sugars are particularly important fuel molecules, and they are oxidized in small steps to carbon dioxide (CO2) and water (Figure 2-69). In this section we trace the major steps in the breakdown, or catabolism, of sugars and show how they produce ATP, NADH, and other activated carrier molecules in animal cells. We concentrate on glucose breakdown, since it dominates energy production in most animal cells. A very similar pathway also operates in plants, fungi, and many bacteria. Other molecules, such as fatty acids and proteins, can also serve as energy sources when they are funneled through appropriate enzymatic pathways.
Answer:
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