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    I'm so confused on how to explain this.
    Hope you help me out thanks!
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    Do you mean the effect of temperature AND pH on yeast cells?



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    When you increase the temperature the rate of reaction is also said to increase. This is because the extra heat energy produced when raising the temperature is converted into kinetic energy, which means the molecules all move at an increased speed. The faster molecules mean that there is going to be more collisions in a certain amount of time, and also as the molecules have more energy so therefore when the enzymes collide with a substrate there is more chance of the collision being successful as there is more chance of the molecules having the right amount of energy needed to carry out the reaction.

    However at a certain temperature the enzymes can become denatured and no longer work. This is when the shape of the active site is permanently distorted which means that the substrate molecule can no longer bind to the active site, therefore the reaction cannot take place.

    The pH can also affect the rate of reaction. Enzymes are protein molecules, and some of the 'R' groups on present on the amino acids of the protein have ionic charges, which are affected by pH. By changing the pH you can altar the tertiary structure of the protein as the shape made by the amino acids is altered. This means that you can change the shape of the active site, which therefore stops most substrate molecules from binding to the enzyme, greatly reducing the rate of reaction.
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    (Original post by daxflame)
    I'm so confused on how to explain this.
    Hope you help me out thanks!
    When temperature is changed, the 3D configuration of enzymes (biocatalysts) produced by yeast is disturbed. This will affect the efficiency of the enzyme and thus the overall rate of reaction.

    The same is true when the pH is changed.
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    (Original post by adianadiadi)
    When temperature is changed, the 3D configuration of enzymes (biocatalysts) produced by yeast is disturbed. This will affect the efficiency of the enzyme and thus the overall rate of reaction.

    The same is true when the pH is changed.
    This thread is 3 years old .
 
 
 
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