23 Enzymes can change the speed of chemical reactions because enzymes are able to.

This is because enzymes act in a catalytic reaction and can act as a catalyst for the reaction.

As a result, the activation energy required for the reaction is reduced.

After the activation energy is reduced, the number of activated molecules of the reaction will be increased, thereby increasing the rate of the reaction, and the positive reaction rate and the reverse reaction rate will be increased at the same time.

Therefore, it can be judged that D. is chosen

In fact, the mechanism of action of enzymes is quite complex:

There are many kinds of sayings, all of which have their own truths, let me list some, and the landlord will see for himself, which may help you a little.

The enzyme can bind its substrate to its active site because the chemical reaction speed is proportional to the reactant concentration, if in a local area of the reaction system, the substrate concentration increases, the reaction speed also increases, in addition, the proximity between the enzyme and the substrate has a certain orientation, so that the reactant molecule is acted, which greatly increases the probability of the ES complex entering the activated state.

2.Distortion or strain

Substrate binding can induce a conformational change in enzyme molecules that are much larger than those of substrates.

Changes in the tertiary and quaternary structures can also exert tension on the substrate, distort the substrate, and promote the ES to enter the active state.

3.Acid-base catalysis

The active center of an enzyme has an R group of certain amino acid residues, which tend to be good proton donors or acceptors, and in aqueous solutions these generalized acidic groups or generalized basic groups are potent catalysts for many chemical reactions.

4.Covalent catalysis

Certain enzymes form highly labile, covalently bound ES complexes with substrates that are easier to chemically react with than in the absence of enzymes. �

Do you see if it helps you.

Why is this? These are all memory knowledge points, just like asking you why rare gases are single-molecule gases, they are all memory knowledge points, as long as you remember that inorganic catalysts are to reduce the activation energy of reactants, and biological proteases are to increase the number of activated molecules in reactants, that's it.

Enzymes are acceleratedChemical reactionsThe reason for the speed is that enzymes act as biocatalysts that can significantly reduce chemical reactionsActivation energy

Enzymes refer to proteins or RNAs produced by living cells that are highly specific and catalytic to their substrates.

The catalytic effect of enzymes depends on the integrity of the primary structure and spatial structure of the enzyme molecule. Denaturation of enzyme molecules or depolymerization of subunits can lead to loss of enzyme activity. Enzymes are biological macromolecules.

The molecular mass is less than 10,000 and can reach one million.

The role of enzymes is an extremely important class of biocatalysts. Thanks to enzymes, chemical reactions in living organisms can be carried out efficiently and specifically under extremely mild conditions.

Answer]: A enzyme is a protein (a few RNAs) that are produced by the cells of the organism that play a highly catalytic role in their specific substrates. The catalytic effect of enzymes is essentially to reduce the activation energy of chemical reactions, so as to catalyze chemical reactions, accelerate reaction speed, and improve reaction efficiency.

Answer]: Stool hidden model c

This question assesses "Enzymatic Reaction Machine with Kelly". To accelerate a chemical reaction, activation energy can be given by heating, etc.; Or by changing the reaction pathway, reduce the activation energy required for the reaction to slow down. The enzymatic reaction is formed through the E (enzyme)-S (agent) intermediate complex, which changes the reaction pathway, reduces the activation energy, and accelerates the chemical reaction.

Therefore, the answer to this question is C.

An increase in the amount of enzyme cannot change the equilibrium point of the chemical reaction, but only accelerates the rate at which the chemical reaction reaches equilibrium.

The essence of enzymes is "catalysts", and catalysts will change the rate of forward and reverse reactions at equal rates in chemical reactions, so they will not move in macroscopically, that is, they will not change the equilibrium point of the reaction.

Chemical equilibrium refers to the state in which the positive and negative reaction rates of chemical reactions are equal in reversible reactions under certain macroscopic conditions, and the concentrations of reactants and products do not change. It can be judged by δrgm= =0, A is the chemical potential of species A in the reaction. According to Le Chatre's principle, if a system that has reached equilibrium is changed, the system will change accordingly to counteract the change.

The main factors affecting the movement of chemical equilibrium are concentration, temperature, pressure, etc.

Enzymes, by decreasing the activation energy of the reactants, thereby speeding up the reaction rate, but not changing the equilibrium point. For example, a chemical reaction is like a car going over a mountain, activation energy is like the height of a mountain, and enzymes are like a tunnel.

With the tunnel, it is of course much easier and less time for you to get to the other side of the mountain. However, when you get to the other side of the mountain, whether you go over the mountain or go through the tunnel, your destination will not change, just like the balance point will not change.

a.It is made by living cells.

b.The essence of chemistry is protein.

c.There are cofactors to help.

d.The body provides optimal conditions for enzymes.

e.It can greatly reduce the activation energy of the reaction.

Correct Trace: E

The root cause of enzymes speeding up chemical reactions is: ().

a.Increase the reaction temperature.

b.Increase the frequency of reactant collisions.

c.Reduce the activation energy of the catalytic reaction.

d.Increase substrate concentration.

e.Reduces the free energy of the product.

Correct answer: c

In enzymatic reactions, the enzyme concentration is proportional to the speed of the reaction.

a.That's right. b.Mistake.

Correct round roll answer Tong Yunyu: b