Enzymes and active site notes
Enzymes are biological catalysts that speed up chemical reactions in cells. The active site is the region on the enzyme where substrate molecules bind.
Quiz(13 questions)
1. What is the primary role of enzymes in biological systems?
Termes dans ce set(18)
What are enzymes?
Enzymes are proteins that catalyze biochemical reactions, lowering activation energy.
Active site function
The active site is where substrates bind, facilitating the chemical reaction.
True or false: All enzymes are proteins.
True, because most enzymes are proteins, although some RNA molecules can act as enzymes.
Difference between enzymes and substrates
Enzymes are catalysts, while substrates are the molecules upon which enzymes act.
What is substrate specificity?
Enzymes typically catalyze specific reactions for particular substrates due to shape complementarity.
What affects enzyme activity?
Factors include temperature, pH, substrate concentration, and enzyme concentration.
Fill in the blank: Enzymes work best at their _____ temperature.
optimal
True or false: Enzymes are consumed in reactions.
False, because enzymes are not used up and can be reused.
What is denaturation?
Denaturation is the alteration of an enzyme's structure, resulting in loss of activity.
Coenzymes role
Coenzymes are non-protein molecules that assist enzymes in catalyzing reactions.
What is enzyme inhibition?
Inhibition is the process by which a substance decreases enzyme activity.
True or false: Enzymes increase the speed of chemical reactions.
True, because they lower the activation energy required.
Example of an enzyme
Amylase is an enzyme that breaks down starch into sugars.
What is a competitive inhibitor?
A competitive inhibitor resembles the substrate and competes for the active site.
What is an allosteric site?
An allosteric site is a site on the enzyme other than the active site that regulates activity.
Difference between lock and key model vs. induced fit model
Lock and key suggests a perfect fit; induced fit proposes that the enzyme shape changes to fit the substrate.
Fill in the blank: The substrate binds to the _____ of the enzyme.
active site
What is the effect of pH on enzyme activity?
Extreme pH levels can denature enzymes, reducing their activity.
Questions dans ce set(13)
1. What is the primary role of enzymes in biological systems?
2. Which of the following does NOT affect enzyme activity?
3. What happens to an enzyme at its optimal temperature?
4. Which process can lead to enzyme denaturation?
5. What type of inhibitor competes with the substrate for the active site?
6. Which term describes the region where substrates bind on an enzyme?
7. How do coenzymes assist enzymes?
8. What is the function of the allosteric site?
9. Which of these statements about enzymes is NOT true?
10. What is enzyme specificity?
11. What might happen if an enzyme is denatured?
12. The effect of increasing substrate concentration on enzyme activity is usually:
13. Which of the following best describes the lock and key model of enzyme action?
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