Which statement is true?(1 point)
Anaerobic respiration produces glucose from lactic acid and energy.
Anaerobic respiration produces lactic acid and energy from glucose.
Anaerobic respiration produces glucose and energy from lactic acid.
Anaerobic respiration produces lactic acid from glucose and energy.
To determine which statement is true, we need to understand the process of anaerobic respiration.
Anaerobic respiration is a process that takes place in the absence of oxygen. It occurs in certain microorganisms, as well as in human muscle cells during intense exercise when oxygen supply is limited.
During anaerobic respiration, glucose is broken down to produce energy. This process is called glycolysis and occurs in the cytoplasm of cells. In this process, one molecule of glucose is converted into two molecules of pyruvate.
After glycolysis, there are two possible pathways in anaerobic respiration depending on the organism or the type of cells involved:
1. In some microorganisms, the pyruvate is further converted into lactic acid. This process is called lactic acid fermentation.
2. In human muscle cells, the pyruvate is converted into lactic acid when the oxygen demand exceeds the supply. However, after exercise, the lactic acid can be converted back into glucose by the liver in a process called the Cori cycle.
Now let's analyze the statements:
1. "Anaerobic respiration produces glucose from lactic acid and energy." - This statement is not true because anaerobic respiration does not produce glucose from lactic acid.
2. "Anaerobic respiration produces lactic acid and energy from glucose." - This statement is also not true because during anaerobic respiration, glucose is broken down to produce energy, but it does not produce lactic acid.
3. "Anaerobic respiration produces glucose and energy from lactic acid." - This statement is not true as anaerobic respiration does not produce glucose from lactic acid.
4. "Anaerobic respiration produces lactic acid from glucose and energy." - This statement is true. During anaerobic respiration, glucose is broken down to produce energy, and in certain organisms or cells like human muscle cells, the end product is lactic acid.
Therefore, the correct statement is: "Anaerobic respiration produces lactic acid from glucose and energy."