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Total Cold War and the diffusion of power ..

A result of making glucose is that oxygen must also be made but it is released back into the atmosphere because the cell does not require it for this process, so it is eliminated.



stomata diffusion

The higher concentration of carbon dioxide in the air diffuses into the leaf for photosynthesis.

Diffusion rate, also called flux density (Js, in units of mol m-2 s-1) can be expressed in the simplified version of Fick's equation as:

What is the role of diffusion in a cell? | Yahoo Answers

True examples of diffusion are hard to come by (see Vogel, 1994; Wheatley, 1993).

Dissolved substances have to pass through the cell membrane to get into or out of a cell. Diffusion is one of the processes that allows this to happen.

occurs when particles spread. They move from a region where they are in high concentration to a region where they are in low concentration. Diffusion happens when the particles are free to move. This is true in gases and for particles dissolved in solutions. Particles diffuse down a concentration gradient, from an area of high concentration to an area of low concentration. This is how the smell of cooking travels around the house from the kitchen, for example.

This is a special kind of diffusion that moves water ..

Nevertheless, it serves our purpose to illustrate the general concept of diffusion.

Diffusion allows for the cell membrane to move other particles in and out of the cells until it becomes isotonic and osmosis determines if the cell will either expand or explode (lysed) in a Hypo-tonic solution, or shrived in a Hyper-tonic solution.

During carbon fixation, carbon dioxide in the stroma (which enters the chloroplast by diffusion) reacts with a five-carbon sugar called ribulose bisphosphate (RuBP) to form a six-carbon compound. This reaction is catalysed by an enzyme called ribulose bisphosphate carboxylase (large amounts present within the stroma), otherwise known as rubisco. As soon as the six-carbon compound is formed, it splits to form two molecules of glycerate 3-phosphate. Glycerate 3-phosphate is then used in the reduction reactions.

The greater the difference in concentration between two areas, the greater the rate of diffusion.
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What is the role of the cell membrane in photosynthesis?

Oxygen produced during photosynthesis builds up to higher concentrations and diffuses out of the leaf into the air which has a lower concentration of oxygen.

LabBench Activity Key Concepts Diffusion

The concentration of glucose within the leaf is high when photosynthesis has just occurred, and diffusion involves the movement of molecules from an area of high concentration to an area of low concentration.

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