Biology – Cambridge IGCSE: Biological Molecules
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There are twenty questions in this quiz. Select the correct answer from the given choices.
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Question 1 of 20
1. Question
1 point(s)Which solutions are used for testing for protein, reducing sugar and starch?
test for protein test for reducing
sugartest for starch A Benedict’s iodine biuret B biuret Benedict’s iodine C biuret iodine Benedict’s D iodine biuret Benedict’s CorrectIncorrect -
Question 2 of 20
2. Question
1 point(s)Nutrients are made up of smaller basic units. Nutrients can be identified by food tests.
Which nutrient is a protein?nutrient smaller basic units food test A amino acids Benedict’s test B amino acids biuret test C sugars Benedict’s test D sugars biuret test CorrectIncorrect -
Question 3 of 20
3. Question
1 point(s)Which row correctly identifies the chemical elements found in proteins?
carbon hydrogen oxygen nitrogen A ✔ ✔ ✔ ✔ B ✔ ✔ ✔ x C ✔ x ✔ x D x ✔ x ✔ key
✔= present
x= absentCorrectIncorrect -
Question 4 of 20
4. Question
1 point(s)The key can be used to distinguish between four different chemical substances.
Use the key to identify which substance could be a protein.- contains the element carbon ……………………………………. go to 2
does not contain carbon ………………………………………….. A - contains the element nitrogen ………………………………….. B
does not contain nitrogen ……………………………………….. go to 3 - gives a positive result with Benedict’s test …………………. C
gives a negative result with Benedict’s test ……………….. D
CorrectIncorrect - contains the element carbon ……………………………………. go to 2
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Question 5 of 20
5. Question
1 point(s)The diagram represents a protein molecule.
What do the small circles represent?CorrectIncorrect -
Question 6 of 20
6. Question
1 point(s)Which row shows the elements and basic units that are used in the construction of large food molecules?
food molecules elements basic units A fats carbon, hydrogen, oxygen, nitrogen glucose B fats carbon, hydrogen, oxygen, nitrogen glycerol C starch carbon, hydrogen, oxygen glucose D starch carbon, hydrogen, oxygen glycerol CorrectIncorrect -
Question 7 of 20
7. Question
1 point(s)When bases pair up in the formation of DNA, what is one of the pairings?
CorrectIncorrect -
Question 8 of 20
8. Question
1 point(s)Small molecules are used as the basic units in the synthesis of large food molecules.
Which statement is correct?CorrectIncorrect -
Question 9 of 20
9. Question
1 point(s)The structures of antibodies, DNA molecules and enzymes are specific to their actions.
Which feature of each molecule makes it specific?antibody DNA enzyme A active site binding site base order B base order active site binding site C base order binding site active site D binding site base order active site CorrectIncorrect -
Question 10 of 20
10. Question
1 point(s)Which diagram shows the structure of DNA?
CorrectIncorrect -
Question 11 of 20
11. Question
1 point(s)The bases on one of the strands of a DNA molecule have the sequence shown.
A-A-T-C-T-G
What is the corresponding sequence of bases on the other strand?CorrectIncorrect -
Question 12 of 20
12. Question
1 point(s)The table shows the results of food tests carried out on a fruit.
test Benedict’s biuret ethanol iodine result positive positive negative negative What did the fruit contain?
CorrectIncorrect -
Question 13 of 20
13. Question
1 point(s)Which row shows the chemical elements contained in fats?
carbon hydrogen nitrogen oxygen A ✔ ✔ x ✔ B ✔ ✔ ✔ ✔ C x ✔ ✔ x D ✔ x ✔ ✔ key
✔= present
x= absentCorrectIncorrect -
Question 14 of 20
14. Question
1 point(s)Which reagent is used when testing a food for vitamin C?
CorrectIncorrect -
Question 15 of 20
15. Question
1 point(s)Two enzyme-controlled reactions are shown.
From these reactions, what deduction can be made about enzymes?CorrectIncorrect -
Question 16 of 20
16. Question
1 point(s)What does the digestion of starch produce?
CorrectIncorrect -
Question 17 of 20
17. Question
1 point(s)Which simple molecules are the basic units of protein?
CorrectIncorrect -
Question 18 of 20
18. Question
1 point(s)The roots of plants take up nitrates from the soil.
What are the nitrates used to make?CorrectIncorrect -
Question 19 of 20
19. Question
1 point(s)When solution X is tested with iodine solution, a blue-black colour is observed.
A different solution, Y, is added to a new sample of solution X and the mixture is shaken and left for 30 minutes at 40 °C. When tested with iodine solution, an orange-brown colour is observed.
What are solutions X and Y?X Y A maltose amylase B maltose lipase C starch amylase D starch lipase CorrectIncorrect -
Question 20 of 20
20. Question
1 point(s)The diagrams show a leaf cell before and after staining with iodine solution.
Which substance causes the iodine solution to change colour?CorrectIncorrect
