Tiêu đề 3-Enzymes (Revision Test) - Engeecon Academy 2.0.pdf ✅

Answered Review RESTART QUIZ VIEW QUESTIONS SHOW LEADERBOARD 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 1. Question 1 points The optimum PH of enzymes maltase is: 1. A. 4.5 2. B. 5.5 3. C. 6.1 – 6.8 4. D. 6.7 – 7 Incorrect Explanation: C Enzymes have an optimum pH at which they work very fast. For most enzymes this is about 7-8 (physiological pH of most cell) Optimum pH of enzyme maltase is 6.1-6.8 to convert maltose into glucose. 2. Question 1 points Poisons like cyanide, heavy metal ions and some insecticides are all: 1. A. Competitive inhibitor 2. B. Non- competitive inhibitor 3. C. Co-factor 
4. D. Activators Incorrect Explanation: B Non- competitive inhibitor cause a type of enzyme inhibitors where the inhibitor reduces the activity of the enzyme and binds equally well to the enzyme whether or not it has already bound the substrate. 3. Question 1 points What is the main property of non-competitive inhibitors? 1. A. They do not reduce the rate of enzyme reaction 2. B. They form the enzyme inhibitor complex at the site other than the active site 3. C. They form the enzyme inhibitor complex on the active site 4. D. None Incorrect Explanation: B 
4. Question 1 points Feedback inhibition of enzymes is affected by which of the following? 1. A. Enzyme 2. B. Substrate 3. C. End products 4. D. None Incorrect Explanation: C Feedback inhibition is an enzyme regulatory mechanism, where the end product functions as an allosteric inhibitor, if its concentration crosses a threshold value. 5. Question 1 points Which graph represents the change in substrate concentration during an enzymatically-controlled reaction? 
1. A. 2. B. 3. C. 4. D. Incorrect Explanation: B Increase in amount of a substrate when there is a limited number of enzymes cause decrease in rate of reaction with time due to saturation of active sites 6. Question 1 points Active site of an enzyme has how many definite regions? 1. A. 2 2. B. 3 3. C. 4 4. D. 5 Incorrect Explanation: A The active site of an enzyme has two definite regions, the binding site and the catalyst site. 