1 markWhich row shows the three main elements from the Period Table that are present in most molecules in living organisms?
| A | carbon | oxygen | nitrogen |
| B | hydrogen | carbon | oxygen |
| C | oxygen | sulfur | carbon |
| D | hydrogen | carbon | nitrogen |
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1 markThe drawing shows a food test being carried out in a laboratory.
Which food test is being shown and which food group is being tested for?
Biuret test for proteins
DCPIP test for Vitamin C
Benedict's test for reducing sugars
Emulsion test for fats
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1 markWhich row represents the three main constituents of a DNA nucleotide?
| A | bases | phosphate | nucleus |
| B | deoxyribose sugar | nucleus | chromosome |
| C | bases | deoxyribose sugar | phosphate |
| D | phosphate | chromosome | bases |
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Large biological molecules are made from smaller molecules.
Which row shows the correct molecules?
| starch | protein | lipid | DNA | |
| A | fatty acids and glycerol |
nucleotides | glucose | amino acids |
| B | glucose | fatty acids and glycerol |
nucleotides | amino acids |
| C | nucleotides | amino acids | fatty acids and glycerol |
glucose |
| D | glucose | amino acids | fatty acids and glycerol |
nucleotides |
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1 markThe table below shows the elements and basic units used by cells to make large biological molecules.
|
basic units |
elements |
large molecule |
|
|
A |
amino acid |
carbon, hydrogen, oxygen, nitrogen |
protein |
|
B |
glycerol |
carbon, hydrogen, oxygen, nitrogen |
fats |
|
C |
glycerol |
carbon, hydrogen, nitrogen |
fats |
|
D |
amino acid |
carbon, hydrogen, oxygen |
DNA |
Which row of the table is correct?
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