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What Are Photosynthesis and Respiration?

Cellular Respiration

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Explain how photosynthesis and cellular respiration are a cycle.3.

Respiration occurs in your cells and is fueled by the oxygen you inhale. The carbon dioxide gas you exhale is the result of a completed cycle of cellular respiration.

Chemically speaking, respiration is photosynthesis in reverse, as you can see in this equation:


- Aerobic respiration is a more complete breakdown of glucose, so it yields more ATP than glycolysis, alone
- In eukaryotes, this occurs in a three step process in the mitochondria of cells.

Students will take the photosynthesis quiz and grade in class.

In eukaryotes, the process of aerobic respiration occurs within these organelles.

Cellular respiration produces CO2 as a metabolic waste. This CO2 binds with water to form carbonic acid, helping to maintain the blood's . Since too much CO2 would lower the blood's pH too much, the removal of the excess CO2 must be accomplished on an ongoing basis.

Aerobic respiration, or in the presence of oxygen, uses the end product of (pyruvate) in the to produce much more energy currency in the form of than can be obtained from any . Aerobic respiration is characteristic of when they have sufficient oxygen and most of it takes place in the .

Photosynthesis & Cellular Respiration - Biology Junction

Some organisms are obligate anaerobes (some eubacteria and most archaea) that use these pathways all the time and are poisoned by oxygen.

Fermentation
-alcohol in plants
-Lactic acid/lactate in animals
Glycolysis
1st step in both aerobic and anaerobic respiration
Gylco = sugar
lysis = break
Glucose is broken down into 2 pyruvic acids
Pyruvic acid is also called pyruvate
If Oxygen is present then aerobic respiration occurs
If no Oxygen is present fermentation occurs
Anaerobic Respiration
occurs after glycolysis when no oxygen is present
also called fermentation
Produces less ATP than aerobic
Two types
Alcohol fermentation in plants
Lactic Acid fermentation in animals
Aerobic Respiration
Occurs after glycolysis if oxygen is present
Two steps:
Kreb's cycle
also called citric acid cycle
releases carbon dioxide
Electron Transport Chain
produces the most ATP
Homework
1.


That is why you should talk to your plants.
Cellular Respiration Equation
Sugar and oxygen are changed into water, carbon dioxide and energy in the form of ATP
Steps in Respiration
Aerobic Respiration
(Oxygen present)
1.

OrBoth?
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  • 253A%253Aof%253A%253A-Photosynthesis-and-Cellular-Respiration/.

    Now, we will examine the energy harvesting reactions that ALL living cells perform: Cellular Respiration.

  • Photosynthesis & Cell Respiration Flashcards | Quizlet

    The primary function of this "anaerobic" respiration is to recyclce some chemicals needed to keep glycolysis going.

  • Photosynthesis vs. Aerobic Respiration Flashcards | Quizlet

    The theoretical maximum yield of cellularrespiration is 36 ATP per molecule of glucose metabolized.

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What is the difference between photosynthesis and respiration?

The term cellular respiration refers to the biochemical pathway by which cells release energy from the chemical bonds of food molecules and provide that energy for the essential processes of life. All living cells must carry out cellular respiration. It can be in the presence of oxygen or . carry out cellular respiration within the cytoplasm or on the inner surfaces of the cells. More emphasis here will be placed on where the are the site of most of the reactions. The energy currency of these cells is , and one way to view the outcome of cellular respiration is as a production process for ATP.

Cellular respiration - Wikipedia

During photosynthesis, a plant is able to convert solar energy into a chemical form. It does this by capturing light coming from the sun and, through a series of reactions, using its energy to help build a sugar molecule called glucose. Glucose is made of six carbon atoms, six oxygen atoms, and twelve hydrogen atoms. When the plant makes the glucose molecule, it gets the carbon and oxygen atoms it needs from carbon dioxide, which it takes from the air. Carbon dioxide doesn't have any hydrogen in it, though, so the plant must use another source for hydrogen. The source that it uses is water. There is a lot of water on the earth, and every water molecule is composed of two hydrogen atoms and one oxygen atom. In order to take the hydrogen it needs to build glucose molecules, the plant uses the energy from the sun to break the water molecule apart, taking electrons and hydrogen from it and releasing the oxygen into the air. The electrons it takes are put into an electron transport system, where they are used to produce energy molecules called ATP that are used to build the glucose molecule-- all made possible by the sun's energy. Thus, during photosynthesis a plant consumes water, carbon dioxide, and light energy, and produces glucose and oxygen.

The sugar glucose is important because it is necessary for cellular respiration. During cellular respiration, the chemical energy in the glucose molecule is converted into a form that the plant can use for growth and reproduction. In the first step of respiration, called glycolysis, the glucose molecule is broken down into two smaller molecules called pyruvate, and a little energy is released in the form of ATP. This step in respiration does not require any oxygen and is therefore called anaerobic respiration. In the second step of respiration, the pyruvate molecules are rearranged and combined and rearranged again in a cycle. While the molecules are being rearranged in this cycle, carbon dioxide is produced, and electrons are pulled off and passed into an electron transport system which, just as in photosynthesis, generates a lot of ATP for the plant to use for growth and reproduction. This last step requires oxygen, and therefore is called aerobic respiration. Thus, the final result of cellular respiration is that the plant consumes glucose and oxygen and produces carbon dioxide, water, and ATP energy molecules.

At first, this doesn't seem to make any sense! If the plant can use the energy from the sun to make ATP, why does it go through all the trouble of then using up the ATP to make glucose, just so it can get ATP again? There are two reasons why the plant does this. First, in addition to ATP, the plant needs materials to grow. Glucose is an important building block that is necessary to produce all of the proteins, DNA, cells, tissues, etc. that are important to life, growth, and reproduction. Second, one problem with the sun is that it goes away every night, and during winter it isn't very bright. The plant needs energy all of the time. So, by producing glucose, the plant can store this molecule and then use it to produce energy during the night and over winter when there isn't enough sun to provide good photosynthesis.

It is very interesting how photosynthesis and cellular respiration help each other. During photosynthesis, the plant needs carbon dioxide and water-- both of which are released into the air during respiration. And during respiration, the plant needs oxygen and glucose, which are both produced through photosynthesis! So in a way, the products of photosynthesis support respiration, and the products of respiration support photosynthesis, forming a cycle.

While plants can complete this cycle by themselves, animals cannot, since animals aren't capable of photosynthesis! This means that animals have to survive solely through respiration. Also, since we animals can't produce glucose by ourselves, we have to get it from somewhere else-- from eating plants. We produce carbon dioxide that the plants need, and they produce the oxygen that we need, and then we eat them to get the glucose that we need. It seems that we need the plants a lot more than they need us!

Cellular respiration is a set of metabolic reactions and ..

Glycolysis itself yields two ATP molecules, so it is the first step of anaerobic respiration. , the product of glycolysis, can be used in to produce ethanol and + or for the production of lactate and NAD+. The production of NAD+ is crucial because glycolysis requires it and would cease when its supply was exhausted, resulting in cell death. A general sketch of the anaerobic steps is shown below. It follows Karp's organization.

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