They lower the activation energy required for the reactions to take place

A catalyst provides a reaction pathway with a lower activation energy and so directs the reaction one specific way or accelerates the reaction. An inhibitor blocks a reaction path and so prevents a product or slows down the reaction.

A catalyst decreases the threshold energy for a chemical reaction.

A catalyst decreases energy required for two particles to react.

A catalyst lowers the amount of energy needed to reach the transition state.

A catalyst speeds up a reaction rate because it lowers the activation energy.

The activation energy is the amount of energy required to start a reaction. If less energy is needed, then the same amount of energy can react more times.

At low substrate concentrations, the rate of enzyme activity is proportional to substrate concentration. The rate eventually reaches a maximum at high substrate concentrations as the active sites become saturated.

FALSE!
Enzymes are PROTEINS that can act as catalysts in metabolic reactions.

Cooling generally slows down enzyme activity by decreasing the kinetic energy of the enzyme molecules, limiting their ability to collide with substrate molecules and facilitating the formation of enzyme-substrate complexes. Heating, on the other hand, initially increases enzyme activity by providing more kinetic energy for enzyme-substrate collisions and enhancing the rate of reaction. However, excessive heat can denature enzymes, causing them to lose their shape and function, ultimately decreasing enzyme activity.

A catalyst is a substance whose presence alters the rates of the reaction without themselves undergoing any permanent change in concentration or composition .

No. It is not. Have a good day.

Enzymes are proteins that process certain substrates (substances).

Each enzyme has a different purpose,

builder enzymes: builder enzymes take 2 or more substrates in to their "active site" and creates a new substance.

Breaker enzymes: Breaker enzymes "break down" substrates via their "active site" this is important in the human body.

Some important enzymes for humans are:

Protease: Breaks down protiens,

Carbohydrase: breaks down carbohydrates

Lipase: Breaks down fats

starch can be used as support. homogeneous metal catalyst can be immobilised on starch.

Jabir ibn hayyan

Al-razi

John Dalton

Dimitri mendeleev

Aristotle

And so on

General Properties

• Catalysts

• Protein

• Specific

• Reversible - can catalyse the reaction in both directions

• Denatured by high temperature and change in pH

• Rate of action affected by temperature and pH

inhibit

Stop relying on others to help you out on your homework. Read your book

Enzyme.

Enzymes

No they do not.

A catalyst is a thing (atom, molecule, element, etc.) that speeds up a chem. rxn by lowering the activation energy without being altered itself. So it only cause the reaction to occur faster, but will not have any affect on the equilibrium. Also, since the catalyst is not altered, it should 'come out' exactly as it 'went in.'

The larger the ionic radius, the more reactive the cation because the outermost electron is held more loosely and therefore more easily lost. In case of anions, the larger the ionic radius, the smaller the force of attraction between the nucleus and the coming -ve electron, so it becomes less reactive.

The coagulase enzyme activates prothrombin, which causes fibrin formation around the bacteria (ie Staph aureus), protecting it from phagocytosis. Of all 3 pathogenic staphylococcal species, only Staph aureus is coagulase positive.

Enzymes are the protein molecules which are involved in the metabolic reactions in the body. These enzymes act as catalysts to various biochemical reactions that take place both in the cell and in extracellular fluids such as stomach acid. They leave the reaction as they entered it with no net chemical changes to the enzyme itself, although some enzymes will chemically react with substrates to form enzyme-substrate intermediates part way through a reaction. They accelerate the reaction by decreasing the activation energy of the reaction, and by weakly binding and orienating substrates into reaction favourable conditions. Enzymes can be called biocatalysts. Most enzymes are proteins but not all proteins are enzymes. There are also Ribozymes, which are enzymes but catalysis is by RNA rather than protein. The ribozyme was first observed by Zaug & Cech in 1986. For their work on ribozymes Thomas Cech and C. Altman received a Nobel prize in 1989. There are several different types of enzymes. Enzymes are highly specific, meaning a particular enzyme will only take part in the particular reaction that it was designed for. • Isomerases - involved in isomerization reactions • Ligases - used to join bonds [ATP is required] • Hydrolases - involved in the hydrolysis of bonds in the presence of water • Transferases - these type of enzymes are helpful to transfer one substrate to another. • Lyases - involved in non-hydrolytic cleavage of bonds •Oxidoreductases - involved in oxidation and reduction reactions This list is non-exhaustive - there are many other types of enzymes as well.

There are two types of amylase enzymes. Salivary amylase is known as ptyalin; act upon carbohydrates in the mouth. Ptyalin begins polysaccharide digestion in the mouth; the process is completed in the small intestine by the pancreatic amylase, sometimes called amylopsin.

extremely high temperatures can decrease the rate of enzyme action very quickly ,the enzyme becomes deactivated (enzyme does not work)