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Enzymes are catalytic molecules that speed up the rates of reactions.

(a) Explain why enzymes are necessary in biological systems.

(b) Discuss three control mechanisms that regulate enzymatic activity.

A) Enzymes decrease the amount of activation energy required for chemical reactions to occur.

B) 1. Cofactors and Coenzymes- Inorganic ions and non protein organic molecules that are necessary to be present on the active site for some enzymes to work. These cofactors participate in the reaction and may even accept or contribute atoms to the reactions.

2. Competitive and Noncompetitive inhibition- Limits the enzyme activity. This occurs when a molecule binds to an enzyme, either on the active site or allosteric site, and decreases its activity.

3. Allosteric Regulation- Causes a different shape in the enzyme. May either inhibit or stimulate an enzymes activity.

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10y ago
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13y ago

Cells regulate enzyme activity through two methods: allosteric inhibition and competitive inhibition. Allosteric inhibition is when something (an ion, an organic chemical, etc.) bonds to a site on the enzyme (not on the active site), and changes the shape of the enzyme. Competitive inhibition is when something (an ion, an organic chemical, etc.) enters the active site so that the true substrate cannot enter into the enzyme to have a reaction.

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11y ago

Enzymes are regulated by controlling the level of transcription for them as well as inhibition. Inhibition is when a compound or protein physically contacts the enzyme and reduces activity. It can block the active sight or bind allosterically and reduce activity. Some inhibitors are not for regulation but compounds from outside of the organism. Many poisons are inhibitors of crucial enzyme activity.

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14y ago

Enzyme activity can be regulated by several factors including temperature, pH, and other cell proteins.

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12y ago

Most cells contain proteins that help turn key enzymes "on" or "off" at critical stages in the life of the cell.

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13y ago

Enzyme speeds up the chemical reaction. So, it would speed the cells for life and live.

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13y ago

lock and key structure, only a certain substrate can bind with the uniquely shaped active site

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11y ago

enzymes are controlled by protein molecules that act as catalyst which speed up the reaction by lowering the activation energy.

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Q: How can enzyme activity be regulated?
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Related questions

What can you do to regain the activity of the enzyme?

The enzyme is inactive at this point. New enzyme must be added to regain enzyme activity


What is the effect of hydrochloric acid on the enzyme activity?

Denature enzyme activity


What are the effects of physical activity on enzyme activity?

Physical activity can alter the shape of enzyme which can cause damage or may the enzyme become inactive


What are the effects of freezing on enzyme activity?

When an enzyme is frozen, it only slows down activity. Unlike boiling an enzyme, it does not stop it from working.


What switchs on enzyme activity while what can switch off or reduce enzyme activity?

activators; inhibitors


What is the effect of cold temperatures on enzyme activity?

Cold temperatures have a drastic effect on an enzyme's activity level. Cold temperatures usually dramatically slow down an enzyme's activity.


What can change the way an enzyme acts?

Enzyme activity is affected by other molecules, temperature, chemical environment (e.g., pH), and the concentration of substrate and enzyme. Activators are molecules that encourage enzyme activity, and inhibitors are enzymes that decrease enzyme activity. Sometimes a cofactor is necessary for the enzyme to work.


Which blocks enzyme activity by binding to the site of an enzyme?

inhibitor


What detects cell activity in a cell?

A strategy for activity-based enzyme detection using a novel enamide-based chemical strategy is described. Enzymatic cleavage of an amide.


What accurately describes how temperature affects enzyme activity?

Enzyme activity increases with temperature, but only up to a point.


Why is protein concentration necessary for accurate comparison of the enzyme activity of the fractions?

Enzyme activity sometimes reflects the amount of protein expressed in a cell--however, due to enzyme inhibitors, the enzyme activity is not always reflective of the amount of protein expressed by a cell.


What determine an enzymes activity?

There are several things that determine an enzyme's activity. The main determinants include the structure of the enzyme, temperature, pH and so much more.