What is the lock and key mechanism in enzymes?
The lock and key mechanism is a metaphor to explain the specificity of the enzymes active site and the substrate. In the same way only certain keys fit a lock, only certain substrates fit an enzyme’s active site. The substrate is specific to a certain active site.
Which two substances find using a lock and key mechanism?
Enzyme and substrate bind using a lock-and-key mechanism. Enzymes act on a specific substrate and a substrate needs a specific enzyme, this is what is called a lock-and-key mechanism. Enzymes and substtates are like a key and a lock, one is for each other.
Which is the best definition of activation?
Which is the best definition of activation energy? the energy required to form or break the bonds of reactant molecules.
What is known as activation energy?
Activation energy, in chemistry, the minimum amount of energy that is required to activate atoms or molecules to a condition in which they can undergo chemical transformation or physical transport
Which is the best definition of activation energy Brainly?
Activation energy is the minimum quantity of energy that the reacting species must possess in order to undergo a specified reaction. So the answer : it is the required to form or break the bonds of reactant molecules that results in a chemical reaction
Which is the best definition of energy?
The most common definition of energy is the work that a certain force (gravitational, electromagnetic, etc) can do. Due to a variety of forces, energy has many different forms (gravitational, electric, heat, etc.) that can be grouped into two major categories: kinetic energy and potential energy.
What is the meaning of enzymatic activity?
Enzyme activity is a measure of the quantity of active enzyme present and is thus dependent on conditions, which should be specified. The SI unit is the katal, 1 katal = 1 mol s−1, but this is an excessively large unit.
How can enzymes be prevented?
Cooks often put cut apples or potatoes in a water bath until they are ready to be cooked. The water reduces contact with oxygen and prevents enzymatic browning. Cooking fruits or vegetables inactivates (destroys) the PPO enzyme, and enzymatic browning will no longer occur. Refrigeration can slow enzymatic browning.
What are the two types of activators for enzymes?
- 1.1 Hexokinase-I.
- 1.2 Glucokinase.
What is an example of an activator?
One example of an activator is the protein CAP. In the presence of cAMP, CAP binds to the promoter and increases RNA polymerase activity. In the absence of cAMP, CAP does not bind to the promoter.
What activator means?
Definition of ‘activator’ 1. a thing or person that activates. 2. Chemistry. a substance used to induce or accelerate a chemical reaction.
What is an allosteric effect?
The binding of a ligand to one site on a protein molecule in such a way that the properties of another site on the same protein are affected. Some enzymes are allosteric proteins, and their activity is regulated through the binding of an effector to an allosteric site.
How do allosteric inhibitors work?
The allosteric inhibitor binds to an enzyme at a site other than the active site. The shape of the active site is altered so that the enzyme can no longer bind to its substrate. When an allosteric inhibitor binds to an enzyme, all active sites on the protein subunits are changed slightly so that they work less well.