Which statement is true?(1 point)
Anaerobic respiration produces glucose and energy from lactic acid.
Anaerobic respiration produces glucose from lactic acid and energy.
Anaerobic respiration produces lactic acid and energy from glucose.
Anaerobic respiration produces lactic acid from glucose and energy.
The Correct Answer and Explanation is :
The correct statement is: Anaerobic respiration produces lactic acid from glucose and energy.
Explanation:
Anaerobic respiration is a metabolic process that occurs in the absence of oxygen. It allows organisms to generate energy by breaking down glucose without using oxygen. This process is particularly important for certain microorganisms, muscle cells during intense exercise, and some other anaerobic organisms.
When glucose is broken down during anaerobic respiration, it undergoes glycolysis, which converts one molecule of glucose (a six-carbon sugar) into two molecules of pyruvate (three-carbon compound) while producing a net gain of two molecules of ATP (the energy currency of the cell). In the absence of oxygen, the pyruvate cannot enter the mitochondria for further oxidation via aerobic respiration. Instead, it is converted into lactic acid in muscle cells or ethanol and carbon dioxide in yeast.
The equation for lactic acid fermentation, which occurs in muscle cells, can be summarized as follows:
[ \text{Glucose} \rightarrow \text{Lactic Acid} + \text{Energy (ATP)} ]
During intense exercise, the oxygen supply may become insufficient to meet the demands of muscle cells, leading to anaerobic respiration. This process allows muscles to continue functioning for a short period, although the accumulation of lactic acid can lead to muscle fatigue and discomfort.
In contrast, when oxygen is present, cells prefer aerobic respiration, which is more efficient and produces a higher yield of ATP. However, anaerobic respiration is vital for short bursts of energy and in environments where oxygen is limited.
In summary, anaerobic respiration converts glucose into lactic acid and releases energy, enabling organisms to survive and function when oxygen is scarce.