There are twenty questions in this quiz. Select the correct answer from the given choices.
0 of 20 Questions completed
You have already completed the quiz before. Hence you can not start it again.
Quiz is loading…
You must sign in or sign up to start the quiz.
You must first complete the following:
0 of 20 Questions answered correctly
Time has elapsed
You have reached 0 of 0 point(s), (0)
Earned Point(s): 0 of 0, (0)
0 Essay(s) Pending (Possible Point(s): 0)
Unfortunately, you have not scored the minimum marks required to pass the quiz. You may review the explanations provided below by clicking on the “View Questions” button before taking the quiz again. You need to score a minimum of 50% to pass, and minimum of 70% to get a Certificate of Completion.
Congratulations!!! You have passed the Quiz. To get a Certificate of Completion, you need to score a minimum of 70%. You may review the explanations provided below by clicking on the “View Questions” button before taking the quiz again. The more you review and practice, the better you will get at it.
Congratulations!!! You have passed the Quiz with a good score. To get a Certificate of Completion, you need to score a minimum of 70%. You may review the explanations provided below by clicking on the “View Questions” button before taking the quiz again. The more you review and practice, the better you will get at it. We have raised the bar because we want you to SUCCEED with brilliant scores.
Congratulations!!! You have passed the Quiz with a score >= 70% and are eligible to get a Certificate of Completion.
|Table is loading|
|No data available|
Question 1 of 20
1. Question1 point(s)
The graph shows how the rate of an enzyme-controlled reaction changes with temperature.
What is happening within the temperature range marked X?CorrectIncorrect
Question 2 of 20
2. Question1 point(s)
A protease is added to a suspension of egg protein in a test-tube and kept at 37 °C.
After 8 minutes, the protein changes from cloudy to transparent.
Which product, or products, will now be present in the test-tube?CorrectIncorrect
Question 3 of 20
3. Question1 point(s)
What are enzymes made of?CorrectIncorrect
Question 4 of 20
4. Question1 point(s)
At which temperature do most enzymes from the human body become completely denatured?CorrectIncorrect
Question 5 of 20
5. Question1 point(s)
The graph shows pH changes in the mouth after eating.
Why is it a good idea to brush teeth after eating?CorrectIncorrect
Question 6 of 20
6. Question1 point(s)
Equal quantities of a protein-digesting enzyme were added to 5 cm3 of protein solutions of different pH. Each tube was kept at 37 °C.
The amount of amino acid in each tube was measured after 3 minutes. The results are shown in the table.
pH amount of amino acid
1 10 2 9 3 7 4 2 5 1 6 1 7 1 8 0
At which pH was the enzyme most active?CorrectIncorrect
Question 7 of 20
7. Question1 point(s)
Four test-tubes were set up as shown in the diagram.
In which tube is the starch digested most quickly?CorrectIncorrect
Question 8 of 20
8. Question1 point(s)
The activity of lipase is measured in four parts of the gut.
Which part has the most lipase activity?CorrectIncorrect
Question 9 of 20
9. Question1 point(s)
The table shows the colour of a biuret solution before and after a food test was carried out.
colour of solution before food test colour of solution after food test blue lilac / purple
Which nutrient was present?CorrectIncorrect
Question 10 of 20
10. Question1 point(s)
The diagram shows some organs of the digestive system.
Where is amylase made?CorrectIncorrect
Question 11 of 20
11. Question1 point(s)
A human cell contains a length of DNA that carries the code for making which substance?CorrectIncorrect
Question 12 of 20
12. Question1 point(s)
A student set up a test-tube containing starch, water and amylase.
How could the student test whether the amylase had digested all the starch?CorrectIncorrect
Question 13 of 20
13. Question1 point(s)
The temperature of an enzyme-controlled reaction is increased by 10 °C.
How does this affect the rate of reaction?CorrectIncorrect
Question 14 of 20
14. Question1 point(s)
In an experiment, the effect of temperature on the action of amylase is investigated.
Six different test-tubes are set up, each containing a mixture of amylase and starch solution.
Which condition should not be kept the same in each of the six test-tubes?CorrectIncorrect
Question 15 of 20
15. Question1 point(s)
The diagram shows an experiment kept at room temperature.
What is present in the water surrounding the membrane after 45 minutes?CorrectIncorrect
Question 16 of 20
16. Question1 point(s)
The diagram shows the lock and key model of enzyme action.
Which is the enzyme and which is the substrate?
enzyme substrate A 1 2 B 1 3 C 3 1 D 3 2CorrectIncorrect
Question 17 of 20
17. Question1 point(s)
The table shows the temperature and pH at which four different enzymes are most active.
Which enzyme is a protease from the stomach?
optimum pH A 25 10 B 37 7 C 40 2 D 50 5CorrectIncorrect
Question 18 of 20
18. Question1 point(s)
The data show the concentrations of sugar and starch in an onion.
total sugar including reducing sugar
/ g per 100g
/ g per 100g
The onion is tested with Benedict’s solution and iodine solution.
Which set of results is correct?
A blue blue-black B blue brown C brick red blue-black D brick red brownCorrectIncorrect
Question 19 of 20
19. Question1 point(s)
The small intestines of cows are similar in general structure and function to the small intestines of humans.
A disease in cows reduces the number of villi in their small intestines.
The cows lose weight and become weak.
What explains this?CorrectIncorrect
Question 20 of 20
20. Question1 point(s)
The diagram shows an experiment on the digestion of the protein in egg albumen by protease.
The protease was taken from a human stomach.
In which test-tube will the protein be digested most quickly?CorrectIncorrect