MCQ-1: Biological Molecules
There are twenty questions in this quiz. Select the correct answer from the given choices.
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Question 1 of 20
1. Question1 point(s)
Which solutions are used for testing for protein, reducing sugar and starch?
test for protein test for reducing
test for starch A Benedict’s iodine biuret B biuret Benedict’s iodine C biuret iodine Benedict’s D iodine biuret Benedict’sCorrectIncorrect
Question 2 of 20
2. Question1 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 testCorrectIncorrect
Question 3 of 20
3. Question1 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 ✔
Question 4 of 20
4. Question1 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
- contains the element carbon ……………………………………. go to 2
Question 5 of 20
5. Question1 point(s)
The diagram represents a protein molecule.
What do the small circles represent?CorrectIncorrect
Question 6 of 20
6. Question1 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 glycerolCorrectIncorrect
Question 7 of 20
7. Question1 point(s)
When bases pair up in the formation of DNA, what is one of the pairings?CorrectIncorrect
Question 8 of 20
8. Question1 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. Question1 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 siteCorrectIncorrect
Question 10 of 20
10. Question1 point(s)
Which diagram shows the structure of DNA?CorrectIncorrect
Question 11 of 20
11. Question1 point(s)
The bases on one of the strands of a DNA molecule have the sequence shown.
What is the corresponding sequence of bases on the other strand?CorrectIncorrect
Question 12 of 20
12. Question1 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. Question1 point(s)
Which row shows the chemical elements contained in fats?
carbon hydrogen nitrogen oxygen A ✔ ✔ x ✔ B ✔ ✔ ✔ ✔ C x ✔ ✔ x D ✔ x ✔ ✔
Question 14 of 20
14. Question1 point(s)
Which reagent is used when testing a food for vitamin C?CorrectIncorrect
Question 15 of 20
15. Question1 point(s)
Two enzyme-controlled reactions are shown.
From these reactions, what deduction can be made about enzymes?CorrectIncorrect
Question 16 of 20
16. Question1 point(s)
What does the digestion of starch produce?CorrectIncorrect
Question 17 of 20
17. Question1 point(s)
Which simple molecules are the basic units of protein?CorrectIncorrect
Question 18 of 20
18. Question1 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. Question1 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 lipaseCorrectIncorrect
Question 20 of 20
20. Question1 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