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Why do biologists believe glycolysis evolved before the Krebs cycle and electron transport chain?

Biologists believe glycolysis evolved before the Krebs cycle and electron transport chain because glycolysis is a simpler metabolic pathway that can occur in the absence of oxygen. This suggests that glycolysis may have evolved earlier in Earth's history when oxygen levels were low. The Krebs cycle and electron transport chain are more complex and rely on oxygen, indicating they likely evolved later.


The source of energy for the process of photosynthesis?

The source of energy for the process of photosynthesis is sunlight. Through a series of complex reactions, plants and other photosynthetic organisms convert light energy into chemical energy in the form of glucose. This process is essential for the production of oxygen and is at the foundation of the Earth's food chain.


The ATP molecule provides evidence for unity within the biosphere because?

The ATP molecule is the universal energy currency used by all living organisms to fuel cellular activities, showcasing a shared mechanism for energy transfer and utilization across different species. Its presence and function in diverse organisms reveal a fundamental unity in the biological processes that sustain life on Earth, highlighting a common ancestry and interconnectedness within the biosphere.


What role did oxygen play in the evolution of life?

With oxygen the organisms of earth could more efficiently use food because as the final electron acceptor in the electron transport chain oxygen is a main player in the conversion of, say, glucose into many ATP molecules per glucose molecule. Oxygen is the most efficient way to do this compared to fermentation which is anaerobic. Thus organisms became multicellular and much more complex with energy to become motile to a greater degree than before.


Is oxidative phosphorylation involved as a pathway with ATP?

Oxidative phosphorylation is involved as a pathway with ATP.Although the many forms of life on earth use a range of different nutrients, almost all carry out oxidative phosphorylation to produce ATP, the molecule that supplies energy to metabolism. This pathway is probably so pervasive because it is a highly efficient way of releasing energy, compared to alternative fermentation processes such as anaerobic glycolysis.

Related Questions

Why do biologists believe glycolysis evolved before the Krebs cycle and electron transport chain?

Biologists believe glycolysis evolved before the Krebs cycle and electron transport chain because glycolysis is a simpler metabolic pathway that can occur in the absence of oxygen. This suggests that glycolysis may have evolved earlier in Earth's history when oxygen levels were low. The Krebs cycle and electron transport chain are more complex and rely on oxygen, indicating they likely evolved later.


The source of energy for the process of photosynthesis?

The source of energy for the process of photosynthesis is sunlight. Through a series of complex reactions, plants and other photosynthetic organisms convert light energy into chemical energy in the form of glucose. This process is essential for the production of oxygen and is at the foundation of the Earth's food chain.


What alkaline earth metal has the largest electron affinity?

Barium has the largest electron affinity among the alkaline earth metals.


The constellations you see from earth appear to change as the?

Earth revolves around the sun. That is why the constellations we see from Earth appear to change.


What is the heaviest transport on earth?

a rocket ship


How many times larger is the earth than an electron?

Using the classical value for the volume of an electron, which is equal to about 9.4×10−44 m3, and the volume of the Earth, which is equal to about 108.321x1019 m3, one can calculate how big the Earth is compared to an electron: Volume of the Earth / Volume of an electron 108.321x1019 / 9.4×10−44 = 11.5x1063 Thus, the Earth is 11.5x1063 times larger than an electron In other words, the Earth is 11500000000000000000000000000000000000000000000000000000000000000 or 11.5 thousand trillion trillion trillion trillion trillion times larger than an electron. Edit: But, nowadays scientists can't say what size an electron is. So that gets us back to "don't know" and that's definite.


What mammals appear on planet earth?

Many mammals appear on planet earth. Here are some of them:oxhumanpigmonkeycatdogfoxwolfantelopeelephantpolar bearhorse


Why does venus appear to be very bright from earth?

Earth's nearest neightbor


What element that increasing electron affinity?

rare earth elements


Where does the earth appear in the sky?

Look down.


What color does mars appear to be from earth?

Green


Where did Arthropods first appear on earth?

yes