Cellular Respiration
Cellular respiration is the process that animals undergo in order to create
energy for themselves. The best way for cells to harvest the energy
stored in food is through cellular respiration, a catabolic pathway for the
production of adenosine triphosphate or ATP. ATP is a high energy molecule
that is expending by working cells. Cellular respiration occurs in both
eukaryotic and prokaryotic cells. This process has three main stages;
glycolysis, the critic acid cycle, and electron
transport.
Glycolysis basically means “splitting sugars”. Glucose, which is a six carbon sugar, is split up into two three carbon sugars. During this process, two molecules of ATP, two molecules of pyruvic acid and two “high energy” electron carrying molecules of NADH are produced. This stage of cellular respiration can occur both with and without oxygen. However, with oxygen, this is the first stage of cellular respiration. Without oxygen though, glycolysis allows cell to make small amounts of ATP, which is called fermentation.
The Critic Acid Cycle or Krebs cycle begins after the two molecules of the three carbon sugar that was produced during glycolysis are converted into a slightly different compound.
This new compound is called acetyl. Through a series of intermediate
steps, several compounds capable of storing “high energy” electrons are produced along with two ATP molecules. These compounds known as nicotinamide adenine dinucleotide(FAD), are reduced in the process. These forms that were reduced carry the “high energy” electrons into the next stage of cellular respiration. The Critic Acid Cycle only occurs when oxygen is present, but doesn’t use it directly.
Unlike The Critic Acid Cycle, Electron Transport requires oxygen directly. The electron transport “chain” is a series of carriers in the membrane of the mitochondria within eukaryotic cells. Through multiple reactions, the
“high energy” are passed to oxygen. Through the process, a gradient is
made, and ultimately ATP is produced.
All
information was acquired from: http://biology.about.com/od/cellularprocesses/a/cellrespiration.htm
Picture
www.phschool.com/science/biology_place/biocoach/cellresp/overview.html
energy for themselves. The best way for cells to harvest the energy
stored in food is through cellular respiration, a catabolic pathway for the
production of adenosine triphosphate or ATP. ATP is a high energy molecule
that is expending by working cells. Cellular respiration occurs in both
eukaryotic and prokaryotic cells. This process has three main stages;
glycolysis, the critic acid cycle, and electron
transport.
Glycolysis basically means “splitting sugars”. Glucose, which is a six carbon sugar, is split up into two three carbon sugars. During this process, two molecules of ATP, two molecules of pyruvic acid and two “high energy” electron carrying molecules of NADH are produced. This stage of cellular respiration can occur both with and without oxygen. However, with oxygen, this is the first stage of cellular respiration. Without oxygen though, glycolysis allows cell to make small amounts of ATP, which is called fermentation.
The Critic Acid Cycle or Krebs cycle begins after the two molecules of the three carbon sugar that was produced during glycolysis are converted into a slightly different compound.
This new compound is called acetyl. Through a series of intermediate
steps, several compounds capable of storing “high energy” electrons are produced along with two ATP molecules. These compounds known as nicotinamide adenine dinucleotide(FAD), are reduced in the process. These forms that were reduced carry the “high energy” electrons into the next stage of cellular respiration. The Critic Acid Cycle only occurs when oxygen is present, but doesn’t use it directly.
Unlike The Critic Acid Cycle, Electron Transport requires oxygen directly. The electron transport “chain” is a series of carriers in the membrane of the mitochondria within eukaryotic cells. Through multiple reactions, the
“high energy” are passed to oxygen. Through the process, a gradient is
made, and ultimately ATP is produced.
All
information was acquired from: http://biology.about.com/od/cellularprocesses/a/cellrespiration.htm
Picture
www.phschool.com/science/biology_place/biocoach/cellresp/overview.html