Enzymes Flashcards Preview

Biology > Enzymes > Flashcards

Flashcards in Enzymes Deck (22)
Loading flashcards...

Define activation energy

Energy required for a reaction to start


Example of activation energy

Mount of energy required to muster up and push a snowball up a hill and down it


Define enzymes

Proteins that lower the activation energy of a reaction


How do enzymes lower the activation energy of a reaction

Enzymes increase the rate of a reaction helping it to occur faster


What do enzymes not to do

They do not consume a reaction-
Simply help it to occur-
Not add snow to your snowball just make it easier to make a snowball


What can enzymes do

Break molecules apart, build or add molecules, and even rearrange them


What happens to the change and energy at the start and end of the chemical reaction

The change and energy remains the same between the start and end of a chemical reaction


Define a substrate

Substance or molecule on which an enzyme functions


How does increasing temperature affect the rate of reaction

Since enzyme catalyzes reactions by randomly colliding with substrate molecules, increasing temperature increases the rate of reaction, forming more product.


What can occur when temperature also increases the vibrational energy

Puts a strain on the bonds that hold enzyme molecules together


What will happen as a result of the strain

Are bonds, especially the week are hydrogen and ionic bonds will break. Breaking bonds with in the enzyme will cause the active site to change shape


What will happen as a result to the active sites shaped change

The change in shape means that the active site is less complementary to the shape of the substrate, so that it is less likely to catalyze the reaction. Eventually the enzyme will become denatured and will no longer function
This will decrease the rate of reaction


What is the enzymes optimum temperature

The temperature at which the maximum rate of reaction occurs


How does pH acidity affect enzyme activity

Ions are charged and therefore interfere with hydrogen and ionic bonds that hold together and enzyme since they will be attracted or pulled by the charge is created by the bonds.


What happens as a result of the ions interference

Causes a change in shape of an enzyme and importantly, it's active site


What happens if there's any change in pH above or below the optimum

Quickly cause a decrease in the rate of reaction, since more of the enzyme molecules will have active sites who's sheets are not complementary to the shape of their substrate


How does concentration affect activity

Changing the enzyme and substrate concentration affect the rate of reaction of an enzyme catalyzed reaction


Controlling these factors in a cell is one way that

An organism regulates is enzyme activity and so it's metabolism


As the concentration proceeds...

The rate of reaction will decrease since the substrate will get used up


What is the initial reaction rate

Highest rate of reaction – maximum reaction rate for an enzyme in an experimental situation


Why will increasing substrate concentration increases the rate of reaction?

More substrate molecules will be colliding with enzyme molecules so more products will be formed


How does enzyme concentration affect enzyme activity

Increasing enzyme concentration will increase the rate of reaction has more enzymes will be colliding with substrate molecules