Enzymes in the body step by step
Enzymes are biological catalysts that speed up chemical reactions in the body, essential for processes like digestion and metabolism.
Quiz(14 questions)
1. Which of the following statements about enzymes is true?
Terms in this Study Set(19)
What are enzymes?
Enzymes are proteins that accelerate chemical reactions in biological systems.
Function of enzymes
They lower the activation energy required for reactions, making processes faster.
True or false: Enzymes are consumed in reactions.
False, because enzymes are not used up and can be reused.
Difference between enzymes and substrates
Enzymes are catalysts, while substrates are the reactants that enzymes act upon.
What is a substrate?
A substrate is the substance on which an enzyme acts during a chemical reaction.
Active site purpose
The active site is where the substrate binds to the enzyme, facilitating the reaction.
What factors affect enzyme activity?
Temperature, pH, substrate concentration, and enzyme concentration influence activity.
Fill in the blank: Enzymes are sensitive to _____.
pH and temperature, which can denature them.
What is enzyme denaturation?
Denaturation is the process where an enzyme loses its functional shape and activity.
True or false: All enzymes are proteins.
True, because all known enzymes are made up of proteins.
What are coenzymes?
Coenzymes are non-protein molecules that assist enzymes in their function.
Example of a coenzyme
Vitamins, such as B vitamins, often serve as coenzymes in metabolic reactions.
What is competitive inhibition?
Competitive inhibition occurs when a substance mimics a substrate and competes for the active site.
What is allosteric regulation?
Allosteric regulation involves molecules binding to sites other than the active site, modifying enzyme activity.
Fill in the blank: Enzymes can speed up reactions by a factor of _____.
Millions, significantly increasing reaction rates.
Difference between endergonic and exergonic reactions
Endergonic reactions require energy input, while exergonic reactions release energy.
What role do enzymes play in metabolism?
Enzymes facilitate and regulate metabolic pathways, allowing organisms to harness energy.
What is the lock and key model?
The lock and key model describes how substrates fit precisely into an enzyme's active site.
What is an enzyme substrate complex?
The enzyme substrate complex forms when a substrate binds to an enzyme, allowing the reaction to occur.
Questions in this Study Set(14)
1. Which of the following statements about enzymes is true?
2. What might happen if the temperature is too high for an enzyme?
3. Which of the following is NOT a factor affecting enzyme activity?
4. What is the effect of a competitive inhibitor?
5. In which type of reaction do enzymes usually participate?
6. What is an allosteric site?
7. Which of the following best describes enzyme specificity?
8. What happens to enzymes at extreme pH levels?
9. Which molecule often serves as a coenzyme?
10. Which reaction is an example of an endergonic reaction?
11. Which scenario illustrates enzyme activity?
12. What characterizes the lock and key model of enzyme action?
13. Which organ primarily produces digestive enzymes?
14. What is the purpose of enzyme kinetics studies?
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