Process Does Not Require Oxygen
2.25: Anaerobic vs Aerobic Respiration
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How long can you hold your breath?
With or without air? In terms of producing free energy, that is the key question. Tin can cellular respiration occur without air? It can, just it does have limitations.
The Presence of Oxygen
There are two types of cellular respiration (run across Cellular Respiration concept): aerobic and anaerobic. One occurs in the presence of oxygen (aerobic), and one occurs in the absence of oxygen (anaerobic). Both begin with glycolysis - the splitting of glucose.
Glycolysis (see "Glycolysis" concept) is an anaerobic process - it does not need oxygen to proceed. This process produces a minimal amount of ATP. The Krebs cycle and electron ship do need oxygen to go along, and in the presence of oxygen, these process produce much more than ATP than glycolysis alone.
Scientists think that glycolysis evolved earlier the other stages of cellular respiration. This is because the other stages need oxygen, whereas glycolysis does non, and in that location was no oxygen in World's temper when life first evolved about iii.5 to 4 billion years ago. Cellular respiration that proceeds without oxygen is called anaerobic respiration.
Then, about 2 or 3 billion years ago, oxygen was gradually added to the temper by early photosynthetic bacteria (cyanobacteria). After that, living things could use oxygen to break down glucose and make ATP. Today, about organisms make ATP with oxygen. They follow glycolysis with the Krebs bicycle and electron send to make more ATP than by glycolysis alone. Cellular respiration that proceeds in the presence of oxygen is chosen aerobic respiration.
Summary
- Cellular respiration always begins with glycolysis, which tin can occur either in the absence or presence of oxygen.
- Cellular respiration that proceeds in the absence of oxygen is anaerobic respiration.
- Cellular respiration that proceeds in the presence of oxygen is aerobic respiration.
- Anaerobic respiration evolved prior to aerobic respiration.
Explore More
Utilise this resources to answer the questions that follow.
- Aerobic vs. Anaerobic Respiration at http://www.diffen.com/difference/Aerobic_Respiration_vs_Anaerobic_Respiration.
- What is the principal divergence between aerobic and anaerobic respiration?
- What cells perform anaerobic respiration?
- Compare the amount of ATP released by both aerobic and anaerobic respiration.
- What are the two stages of anaerobic respiration?
Review
- Define aerobic and anaerobic respiration.
- What process is mutual to both aerobic and anaerobic respiration?
- Why exercise scientists recollect that glycolysis evolved earlier the other stages of cellular respiration?
Process Does Not Require Oxygen,
Source: https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Book:_Introductory_Biology_%28CK-12%29/02:_Cell_Biology/2.25:_Anaerobic_vs_Aerobic_Respiration
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